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Questions for Regents Practice Atomic Structure

Parts A and B-1 Multiple Choice

1. Which conclusion was a direct result of the gold foil experiment?

1) An atom is composed of at least three types of subatomic particles.
2) An atom is mostly empty space with a dense, positively charged nucleus.
3) An electron has a positive charge and is located inside the nucleus.
4) An electron has properties of both waves and particles.

2. In the wave-mechanical model of the atom, orbitals are regions of the most
probable locations of
1) protons 2) positrons 3) neutrons 4) electrons

3. What is the charge and mass of an electron?
1) Charge of +1 and a mass of 1 amu 3) Charge of +1 and a mass of 1/1836 amu

2) Charge of -1 and a mass of 1 amu 4) Charge of -1 and a mass of 1/1836 amu

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4. Which phrase describes an atom?
1) a positively charged electron cloud surrounding a positively charged nucleus
2) a positively charged electron cloud surrounding a negatively charged nucleus
3) a negatively charged electron cloud surrounding a positively charged nucleus
4) a negatively charged electron cloud surrounding a negatively charged nucleus

5. Which total mass is the smallest?
1) the mass of 2 electrons
2) the mass of 2 neutrons
3) the mass of 1 electron plus the mass of 1 proton
4) the mass of 1 neutron plus the mass of 1 electron

6. Which statement concerning elements is true?
1) Different elements must have different numbers of isotopes.

2) Different elements must have different numbers of neutrons.
3) All atoms of a given element must have the same mass number.
4) All atoms of a given element must have the same atomic number.

7. Which value of an element is calculated using both the mass and the relative
abundance of each of the naturally occurring isotopes of this element?
1) Atomic number 2) Atomic mass 3) Half-life 4) Molar volume

8. Which sequence represents a correct order of historical developments leading to

the modern model of the atom?
1) Atom is a hard sphere atom is mostly empty space electrons exist in
orbitals outside the nucleus
2) Atom is a hard sphere electrons exist in orbitals outside the nucleus
atom is mostly empty space
3) Atom is mostly empty space atom is a hard sphere electrons exist in

orbitals outside the nucleus

4) Atom is empty space electrons exist in orbitals outside the nucleus
atom is a hard sphere

9. An atom is electrically neutral because the
1) number of protons equals the number of electrons
2) number of protons equals the number of neutrons
3) ratio of the number of neutrons to the number of electrons is 1:1

4) ratio of the number of neutrons to the number of protons is 2:1

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