element? Element Name Period Group # Family Туре Na Fe Br Xe Ca

Q: Should the elemental symbol for lead be written as Pb or PB? What confusion could arise if the wrong…

A: Elemental symbol for lead is Pb and it should be Pb .

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: HNO3 NBS H,SO4 light AICI3 Fe HCI

A: Chemical reaction:

Q: X Select the 4 properties of metals * Hard Conducts electricity Smells bad Does NOT conduct heat…

A: Metals are those substances which usually lose there valence electrons to form compounds.

Q: The mass of an atom of hydrogen is 1.673 x 10-24 g. How many atoms are in a 10.5 g sample of…

A: Given, Mass of a hydrogen atom = 1.673*10-24 g. Mass of sample = 10.5g.

Q: Which of the following elements are metals? C Ca Br Co Ni Ar Li Al O ?

A: Metal are electropositive in nature  Metals are have less electronegativity  In periods from left to…

Q: Which of the following elements is a metal? O о As I Sn Se

A: To solve this problem we have to identify the given elements as metals

Q: An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99…

A:

Q: An element has two isotopes. One isotope has a mass of 63.22 g. The other has a mass of 67.88 g. If…

A: An isotope of an element contains different number of neutrons in their nucleus. That is, isotopes…

Q: What is the name of the element that is in group 3A and period 2? fill in the blank 1What is the…

A: The objective of the question is to identify the elements that are located in specific groups and…

Q: Write a complete chemical formula, including physical state symbol, for each element listed below in…

A:

Q: olo There are only two naturally-occuring stable isotopes of boron, the masses of which are listed…

A: We will calculate the natural or relative abundance of Boron isotopes. we will apply simple mole…

Q: Differentiate between an atom, an element, and a molecule.

A: Element - are naturally occurring species  Atom-building block of molecule  Molecule - made up of…

Q: Write a complete chemical formula, including physical state symbol, for each element listed below in…

A: Each and every element has different chemical symbols or formula, which specific for them but…

Q: Name the scientist who receives the major credit for the development of the periodic table. In what…

A: The long form of periodic table is the arrangement of all elements in the increasing order of their…

Q: Naturally occurring uranium consists of two isotopes, whose masses are shown below: Isotope Mass…

A:

Q: SO3 Cl₂ H₂SO4 AICI,

A: The multi step organic reaction is given and we have to find out the product of the multi step…

Q: Which of the following could describe an element?   I II III All of them None of them

A: Matter: Matter can be defined as any component which occupies space and has mass.

Q: - Classify each element as a metal or nonmetal. Cl Fe Metal Ca Ne Answer Bank Zn Nonmetal

A:

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: There are two naturally occurring isotopes of copper. 63 Cu has a mass of 62.9296 u. 65 Cu has a…

A: Given: There are only 2 naturally occurring isotopes of Cu. Mass of 63Cu = 62.9295 u. And mass of…

Q: What is the symbol for the element that is in group VIIA(17) and period 3?   What is the symbol…

A:

Q: Highest electronegativity Largest atomic radius Highest first ionization energy Element that…

A: Answer: This question is based on periodicity in the properties of elements in a periodic table.

Q: Nickel Oxygen Barium Tin Hydrogen Oxygen Calcium Sulfur Iron Carbon

A: On the basis of Electronegativity difference we can classify different Molecules as ionic , non…

Q: A sample of lithium consists of 400 atoms. 30 atoms are the isotope Lithium-6 (6.015 amu) and 370…

A: Calculation of average atomic mass using % abundance of isotopes:

Q: Use the pictures below to answer the question. 6. Choose the two elements that are located on the…

A: Hence the correct answer is 2 and 3

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

A: Given a table about description of element with atomic number 92 or less 92. Which description…

Q: Which of the following elements is not a representative element? O Nickel Cadmium Silicon O Barium

A: I A, IIA, IIIA, IV A, VA, VI A, VII A, VIII A elements are called representative elements. Between…

Q: number (use Roman numeral) to which the following elements belong. Example:  Hydrogen - period 1,…

A: Period number and group number are assigned to element according to periodic table. There are 7…

Q: Write a complete chemical formula, including physical state symbol, for each element listed below in…

A: Each and every element has different type of symbolic representations, are known as chemical formula…

Q: The elements of group 4A show an interesting change in properties moving down the group. Give the…

A: The name and chemical symbol of each element in the group 4A is to be given and label it as a…

Q: (1) What is the name of the element with a valence electron configuration of 3s¹? (2) What is the…

A: Electronic configuration gives the knowledge about the elements.  It is the arrangement of electrons…

Q: An element has the following natural abundances and isotopic masses: 78.99% abundance with 23.985…

A:

Q: Use the mass spectrum 100% of mercury shown here to estimate the atomic mass of mercury. Esti- mate…

A: Mass spectroscopy is used for determining the atomic mass of an element. The position of each peak…

Q: Mg2+ p3- NO3

A: Since you have posted a  question with sub-parts , we are entitled to answer the first three…

Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.