Atomic structure review

The mass of an electron is

• equal to the mass of a proton

• equal to the mass of a neutron

• greater than the mass of a proton

• less than the mass of a neutron

Atoms are neutral because the number of

• protons equals the number of neutrons

• protons equals the number of electrons

• neutrons is greater than the number of protons

• neutrons is greater than the number of electrons

Tags

NGSS.HS-PS1-7

What is the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons?

• 1+

• 2+

• 1-

• 2-

The results of the gold foil experiment led to the conclusion that an atom is

• mostly empty space and has a small, negatively charged nucleus

• mostly empty space and has a small, positively charged nucleus

• a hard sphere and has a large, negatively charged nucleus

• a hard sphere and has a large, positively charged nucleus

Tags

NGSS.HS-PS1-8

Which statement describes the distribution of charge in an atom?

• A neutral nucleus is surrounded by one or more negatively charged electrons.

• A neutral nucleus is surrounded by one or more positively charged electrons.

• A positively charged nucleus is surrounded by one or more negatively charged electron.

• A positively charged nucleus is surrounded by one or more positively charged electrons.

The elements on the Periodic Table of the Elements are arranged in order of increasing

• atomic number

• mass number

• number of neutrons

• number of valence electrons

Compared to an atom of C-12, an atom of C-14 has a greater

• number of electrons

• number of protons

• atomic number

• mass number

An atom that contains six protons, six neutrons, and six electrons has a mass of approximately

• 12u

• 12g

• 18u

• 18g

Tags

NGSS.MS-PS1-1

The atomic mass of an element is the weighted average of the atomic masses of

• the least abundant isotopes of the element

• the naturally occurring isotopes of the element

• the artificially produced isotopes of the element

• the natural and artificial isotopes of the element

Which notations represent atoms that have the same number of protons but a different number of neutrons?

• H-3 and He-3

• S-32 and S-32

• Cl-35 and Cl-37

• Ga-70 and Ge-73