Answer the question below. Use the rubric in the materials for help if needed. Use details to support your ideas.  Dmitri Mendeleev left gaps or holes in his model of the periodic table. What did these gaps represent?

Q: Tin, element 50 on the periodic table, has 10 stable isotopes. 117^Sn makes up 7.687% of naturally…

A: Using the formula moles of Sn117 is calculated as,

Q: The radius of a strontium atom is 215 pm. How many strontium atoms would have to be laid side by…

A: Given that Radius of strontium atom = 215 pm . Since we know that Diameter = 2 × Radius =2 × 215 pm…

Q: Organization of the Periodic Table Read each description in the first column of the table below. If…

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Q: What THREE elements are rare-earth elements? calcium neodymium rhenium niobium samarium thallium…

A: In the above question the elements which are rare earth metal  among the option provided are…

Q: Chemical analyses conducted by the first Mars Rover robotic vehicle in its 1997 mission collected…

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Q: . What is the 3rd most prevalent element in the human body (name, not symbol)?

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Q: ving elements in order from lowest boiling point to highest

A: In this question four compounds are given and order of boiling point asked.

Q: Calculate the mass of H2SO4.

A: Mass of H2SO4 is 98.

Q: Identify an element that would have similar properties as magnesium (Mg). Explain your choice and…

A: The element that has the similar properties like magnesium is -

Q: The radius of a strontium atom is 215 pm. How many strontium atoms would have to be laid side by…

A: Diameter = 2 X Radius

Q: Classify the substance shown in the sketch below. You can click the other tabs in the sketch to get…

A: Given: The sketch provided shows a substance.  Looking at 1000X, it seems to be hard and a pattern…

Q: Be sure to answer all parts. (1) Deduce the formula of iron(III) sulfide.Click in the answer box to…

A: An ionic compound should be neutral. Hence, the number of negative and positive charges must be…

Q: 1) How do we know that air is not a single substance? 2) Metals have many similar properties, but…

A: In this review we will examine several basic concepts of matter and materials, from the…

Q: Describe why "new" elements (man-made elements) are created, or why do we benefit in creating them?…

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Q: Give the formula for the compound formed when sulfur trioxide reacts with water.   Give the…

A: • We need to determine the formula for the compound formed when sulfur trioxide reacts with water.…

Q: Use a model to explain how subatomic particles interact to cause ONE of the following periodic…

A: Various atomic models were proposed from time to time to explain the structure of an atom and how…

Q: The hydroxides formed by three elements of period 3 are given in the following table. Write the…

A: Period 4 elements for group 1A--K, Potassium                                                2A--Ca,…

Q: Based on the location of the elements magnesium (Mg) and bromine (Br) in the Periodic Table, which…

A: We have to select the correct statement for the compound MgBr2

Q: Elements that form ions are important for a range of biological processes. You have learned…

A: We know, when an atom loses one or more electrons – then the atom becomes positively charged and the…

Q: State the number of electrons in Se^2−. Express your answer as an integer.

A: Since we know that  When there is positive charge on an atom it means that it has lost the electrons…

Q: Part A There are conventions for naming and constructing the formulas for acids and bases just as…

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Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A: We have been provided with data from mass-spectroscopic analysis, including the masses of ruthenium…

Q: . The Group 18/VIII elements are known as the noble gases.  Answer the following true or false…

A: Identify which are true nd which are false statement---

Q: Predict the products of the reaction below. That is, complete the right-hand side of the chemical…

A: The question is based on the concept of chemical reactions. we need to complete the reaction…

Q: How could a carbon atom could become a nitrogen atom? Explain and be specific in your explanation

A: Nuclear reaction: The given reaction is a nuclear reaction. In the nuclear reaction, one nuclide is…

Q: Express your answer as an ion. cesium   chlorine   magnesium   nitogen

A: Ion is a chemical specie formed as result of loss or gain of electron by a neutral isolated…

Q: There are 1.699 x 1022 atoms in 1.000 g of chlorine.  Assume that chlorine atoms are spheres of…

A: Number of atoms in 1 g chlorine = 1.699 × 1022 atoms Number of atoms in 0.5 g chlorine = 0.5 × 1.699…

Q: If 4 Kg of Gallium (Ga) is reacted with 11 Kg of Nitrogen (N). what mass of GaN will be formed? The…

A: We have given 4 Kg = 4000 g of Gallium (Ga) which is reacted with 11 Kg = 11000 g of Nitrogen (N2).…

Q: What is the total number of oxygen atoms on the left-hand side of this chemical equation? 2 Ca,…

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Q: 32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur troxide. If 20 g of sulfur…

A: Mass of S = 20 gMass of Oxygen(O2) = 100 gMolar mass of S = 32.06 g/molMolar mass of O2 = 32…

Q: Aqueous potassium nitrate (KNO3) and solid silver bromide are produced by the reaction of aqueous…

A: When aqueous potassium bromide react with aqueous silver nitrate it forms precipitate of silver…

Q: Calculate the amount of carbon (in moles) contained in a 2.65 g pencil “lead.” (Assume that the…

A: The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a…

Q: When a 220 g sample composed of ibuprofen (C13H1802) and some inert material is added, the mass of…

A: The mass percentage of an element in a given compound is a measure of the amount of the element…

Q: 12. Four students were asked to complete a table for a science assignment. Each student selected one…

A: Description of question with answer given

Q: Part A aluminum and oxygen Express your answer as a chemical formula. Submit | ΑΣΦ A chemical…

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Q: A 2.540 g sample of an oxide of tin was heated in the air until the mass of the sample no longer…

A: Mass of tin (IV) oxide is 2.842 gmolar mass of tin (IV) oxide = 150.71 g/molatomic mass of tin =…

Q: a certain compound is made up of 2 chlorine atoms, one carbon atom, and one oxygen atom. What is the…

A: A chemical formula is defined as the composition of elements present in the compound in a fixed…

Q: The zinc inside the penny reacted with acetic acid (C

A: Chemical reactions are expreseed in equation form , these equations are called " chemical…

Q: Part 1: Vocabulary Define the following terms: (from what you remember from middle school) Matter:…

A: Answer for part 1 Matter It is the substance of which any physical object consist. Atom It is the…

Q: Of the elements listed below, which one would be a poor conductor of heat and electricity? a) Mg b)…

A: Which element among the following Mg, CS, Se, Sn & Zn   is poor conductor of heat and…

Q: 4. Look up the properties of iron, barium, and phosphorus. Explain why nails are made of iron but…

A: Iron is  a hard metal . It shows various properties like malleability ( transform into thin sheets),…

Q: Predict the compound formed between a cesium atom and a sulfur atom. Write it's formula. Classify…

A: Cs is a metal which loose electron  and sulfur is a non metal which gain electron  Cs is 1 group…

Q: List the main characteristics that an Earth material must possess to be considered a mineral and…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: 5) Which of the following gases exists as a diatomic molecule? A) krypton C) hydrogen B) argon

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Q: Much of the evidence for the existence of atoms comes from Multiple Choice chemistry. mechanics.…

A: Atom is the smallest individual particle having its existence.