Unit 2 - Atoms and Periodic Table Review

The diagram below is the Bohr model of an atom.

Which best describes this atom?

• It has 6 electrons.

• It has a positive charge.

• It has 6 valence electrons.

• It has a full outermost energy level.

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The tiny, negatively charged particles are

• nucleus

• protons

• electrons

• neutrons

The attraction of a rubbed comb for paper gives evidence that

• matter is electrical in nature

• matter is magnetic

• matter contains electrons

• matter is electrically neutral

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When two similarly charged objects are brought closer together, they

• attract each other

• stick to each other

• have no effect on each other

• repel each other

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The central portion of an atom is called the

• nucleus

• shell

• electron

• ring

In a neutral atom, the number of electrons is

• equal to the number of neutrons

• greater than the number of protons

• less than the number of protons

• equal to the number of protons

Atoms of the same element that differ slightly in mass are called

• neutrons

• ions

• isotopes

• positrons

The differences in the mass of atoms of the same element are attributed to different numbers of

• protons

• neutrons

• electrons

• positrons

Of the following, the particle generally not found in the nucleus of an atom is

• a hyperon

• a meson

• an electron

• a muon

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An atomic particle with a mass approximately 1/1837 of a proton is

• a hyperon

• a neutron

• a muon

• an electron