Chemistry Regents January

Which statement describes the charge and location of an electron in atom?

• An electron has a positive charge and is located outside the nucleus.

• An electron has a positive charge and is located in the nucleus.

• An electron has a negative charge and is located outside the nucleus.

• An electron has a negative charge and is located in the nucleus

Which statement explains why a xenon atom is electrically neutral?

• The atom has fewer neutrons than electrons.

• The atom has more protons than electrons.

• The atom has the same number of neutrons and electrons.

• The atom has the same number of protons and electrons.

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If two atoms are isotopes of the same element that atoms must have

• the same number of protons and the same number of neutrons.

• the same number of protons and a different number of neutrons.

• a different number of protons and a different number of neutrons

• a different number of protons and a different number of neutrons.

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Which electrons in a calcium atom in the ground state have the greatest effect on the chemical properties of calcium?

• the two electrons in the first shell

• the two electrons in the fourth shell

• the eight electrons in the second shell

• the eight electrons in the third shell

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The weighted average of the atomic masses of the naturally occurring isotopes of an element is the

• atomic mass of the element

• atomic number of the element

• mass number of each isotope

• formula mass of each isotope

Which element is classified as a metalloid?

• Cr

• Cs

• Sc

• Si

Which statement describes a chemical property of iron?

• Iron oxidized.

• Iron is a solid at STP

• Iron melts.

• Iron is attracted to a magnet.

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NGSS.HS-PS1-1

Graphite and diamond are two forms of the same element in the solid phase that differ in their

• atomic numbers

• crystal structures

• electonegativities

• empirical formulas

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Which ion has the largest radius?

• Br^-

• Cl^-

• F^-

• I^-

Carbon monoxide and carbon dioxide have

• the same chemical properties and the same physical properties

• the same chemical properties and different physical properties

• different chemical properties and the same physical properties

• different chemical properties and different physical properties