PART 1: WHAT IS THE IDENTITY OF THE ATOM? A scanning tunneling microscope (STM) allows scientists to manipulate individual atoms. Below is an image of the IBM logo created by manipulating atoms using an STM. Each dot in the picture is one atom of the same element. IBM RESEARCH/SCIENCE PHOTO LIBRARY (a) The letter I was made using 9 atoms of the same element. Calculate the number of moles, of atoms in the letter I in the picture above.

Q: What is distinctive about isotopes of elements, and why are they important?

A: The atomic number of an element is expressed as the number of protons and it is equal to the number…

Q: Why has the atomic model changed over time?

A: Atomic model are the model proposed by eminent scientist to explain the structure of the atom and…

Q: What is the charge of an ion that contains 21 protons and 19 electrons?

A: For any neutral atom, the number of electrons present in the atomic shells is equal to the number of…

Q: what is a diatomic element and how do you determine its mass and atomic number?

A: In this question, we have to explain what is a diatomic element and how do you determine its mass…

Q: How are the concepts of an atom and an element related? What causes elements to differ?

A: A particular atom will have the same number of protons and electrons and most atoms have at least as…

Q: C. How to entertain your atom (and make it excited) What is the energy level and the possible sets…

A: G g g hi

Q: A carbon atom has a mass number of 12 and an atomic number of 6. How many neutrons does it have?

A: The atomic no. of the atom can be described as the total no. of protons that are present in the…

Q: How many isotopes of chlorine exist in nature?

A: The element chlorine has two isotopes, chlorine–35 and chlorine–37.

Q: Specify the relative charge on an electron and a proton

A: The relative charge on an electron and a proton have to be described below.

Q: A 25g sample of an element had 2.895x 10^23 atoms. Identify it

A: Given: mass of element = 25g number of atoms = 2.895 x 1023 To determine: The identification of the…

Q: What elements are in the mystery star #15? Helium Hydrogen Sodium Lithium O lithium and helium O…

A: The spectra of elements given are,

Q: What particles in an atom are most responsible for the chemical properties of the atom?

A:

Q: Why is an isolated atom neutral?

A: Isolated means not interacting with the surrounding. Neutral means that there is no charge present…

Q: A 20.0 g sample of an element contains 3.89 x 1023 atoms.

A: Given:-  Number of atoms = 3.89 × 1023atoms Mass of sample = 20.0g

Q: What is the mass number of a phosphorous (P) atom with 17 neutrons?

A:

Q: What is an atomic mass unit? Why is it necessary to introduce such a unit?

A: Matters are the substances that possess some mass and volume. These are formed by joining very small…

Q: Which of these is found in the nucleus of an atom? * -Protons -Electrons -DNA -Depends on the atom

A:

Q: Which elements make up about 99% of the mass of living things?

A: Elements are very important for the maintenance of biological life. For example sodium and potassium…

Q: which Atom is the smallest A) carbon B) silicon C) phosphorus D)Nitrogen

A:

Q: Discuss the structure of an atom in terms of its electrons, protons, and neutrons.  b) A neutral…

A: The structure of an atom is similar to the solar system in which all the planets revolve around the…

Q: Does the number of protons define the element? How?

A: Does the number of protons define the element? How?

Q: What particles are found in the nucleus of an atom? What is the charge of the nucleus?

A: Sub-atomic particles are the particles that are present inside the atom. Three sub-atomic particles…

Q: Determine the charge of the ion  tungsten ion with 68 electrons

A: The charge on the ion is given by the difference between the number of protons and the number of…

Q: Which neutral atom is this ? Which group and period ?

A: The electron configuration  corresponds to the element iron (Fe) with an atomic number of 26. Iron…

Q: Given the following atomic symbol: 41 19 X Which element would be X?

A: To find out the element X, we need to check the atomic number of the element X in the periodic table…

Q: Describe the plum-pudding model of the atom.

A: The 'plum pudding' model of the atom was proposed by J.J Thomson. According to this model, the atom…

Q: What did Ernest Rutherford discover about the structure of an atom ?

A: Rutherford carried out alpha-particles scattering experiment by the bombardment of high speed…

Q: How are isotopes depicted in an atomic symbol?

A:

Q: An electrical charged atom or group of atoms. What is it

A: All the substances in thE universe are made up of tiny particles known as atoms. Atoms can be…

Q: What is the mass number of an atom of calcium that has 21 neutrons?

A: We know ,  Mass number of an atom = number of proton + number of neutron

Q: Which of the following is the most important factor in determining the chemical properties of an…

A: Atoms consists of protons, electrons and neutrons

Q: A 20.0 g sample of an element contains 4.95 * 1023 atoms. Identify the element.a) Cr…

A: The element has to be identified.

Q: What is the correct shorthand notation for an atom of

A: For an atom representation first, write its symbol and then in superscript on the left side of  the…

Q: How does the structure of an atom relate to its chemical properties?

A: Atoms are the basic building blocks of matter and play a crucial role in determining the chemical…

Q: Write the standard atomic notation for an atom with 20 neutrons, 26 electrons, and 26 protons. Note…

A: This solved by atomic number and atomic weight determination.

Q: For the 19O2- Isotope identify the number of Protons,  Neutrons,  Electrons

A: For a general element, XZA Z- atomic number = number of protons A- mass number = number of protons +…

Q: Isotopes are… (answer)

A: Isotope- Isotopes are  elements that all have the same number of protons but different numbers of…

Q: What does the atomic structure or the atomic number tell us about the identity of an element?

A: We have to tell what does the atomic structure or the atomic number tell us about the identity of an…

Q: Describe our current understanding of an atom?

A: The solution is given  below-

Q: How many isotopes does this element have?

A: From the graph, it is cleared that the number of isotopes of the unknown element is 5.

Q: How many atoms are present in 44.96 g of

A: Mass of scandium = 44.96 g Molar masa(MM) of Scandium = 44.96 g/mol Moles = mass/MM  = 44.96/44.96 =…

Q: What are some characteristics of the “space” inside an atom?

A: According to Dalton's atomic theory,  Matter is buildup by small particles called atoms  Atoms are…

Q: Which of the following are isotope pairs?

A: an atom has electron, proton, neutron atomic number =number of proton mass number = sum of proton +…

Q: why Rutherford's model of an atom was considered to be unstable?

A: Rutherford’s experiment:Rutherford suggested that there is something at the center of the metal…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.