Atomic Structure Review

Neutral atoms have

• more negative charge than positive charge

• more positive charge than negative charge

• variable charge

• equal amounts of positive and negative charge

Tags

NGSS.MS-PS1-1

The mass number of an element is the number of

• protons and neutrons in the nucleus

• free protons in the nucleus

• electrons and protons in the nucleus

• electrons in all the shells

Tags

NGSS.MS-PS1-1

All atoms of a given element have the same

• number of nucleons

• number of neutrons

• number of protons

• atomic mass number

An atom containing 9 protons, 10 neutrons, and 9 electrons has a mass number of

• 28

• 19

• 18

• 9

Tags

NGSS.MS-PS1-1

Subatomic particles which are equal in magnitude but opposite in charge are

• protons and electrons

• protons and neutrons

• nucleons and neutrons

• neutrons and electrons

A pure substance whose atoms all have the same atomic number is

• a compound

• an element

• a radical

• a mixture

Which particle has the least mass?

• proton

• neutron

• electron

• sand

Isotopes of the same element do not have the same

• number of electrons

• mass number

• atomic number

• electron configuration

As the atomic number of the elements increases, the number of protons in the nucleus

• decreases

• increases

• stays the same

What is the charge of an electron?

• positive

• negative

• neutral

Tags

NGSS.MS-PS2-5