Ions and Isotopes

When an atom loses a valence electron, it becomes a ____________ ion.

• positive

• negative

• neutral

• polyatomic

Atoms of the same element must always have the same number of ________.

• electrons

• neutrons

• isotopes

• protons

The _______ of an atom is the sum of the protons and neutrons in the nucleus of the atom.

• atomic mass

• atomic number

• atomic weight

• isotope weight

Two atoms of the same element that have different mass numbers are called ____.

• electrons

• isotopes

• variables

• ions

How many protons are in an atom with an atomic number of 20, atomic mass of 45, and a charge of +2?

• 20

• 18

• 45

• 22

Tags

NGSS.MS-PS1-1

Isotopes are elements with a different number of ________.

• protons

• electrons

• neutrons

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74, and a charge of -2?

• 34

• 74

• 32

• 36

Tags

NGSS.MS-PS1-1

How many neutrons does this isotope of lithium have?

• 4

• 3

• 5

• 8

Tags

NGSS.MS-PS1-1

What particle provides the positive charge for an atom?

• proton

• electron

• neutron

• nucleus

What do these isotopes of carbon all have in common?

• neutrons and atomic mass

• atomic number and neutrons

• atomic number and atomic mass

• atomic number and electrons

Tags

NGSS.MS-PS1-1