Protons and Electrons 8.5B

The number of protons in an atom is equal to the element’s-

• mass number

• isotope

• valence

• atomic number

The number of protons + neutron of an atom is-

• atomic number

• mass number

• isotope

• valence

Atoms of the same element that have varying numbers of neutrons are-

• isotopes

• inropes

• retopes

• coropes

In an atom, electrons are located outside of the nucleus in an-

• electron nucleus

• rain cloud

• electron cloud

• dry cloud

An electron cloud is arranged in groups known as-

• electron energy

• group electrons

• isotopes

• energy levels/shells

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Electrons in an energy level close to the nucleus are _________ in energy than electrons in an energy level further from the nucleus.

• higher

• lower

The first energy level that is closest to the

nucleus can hold ___ electrons. The next energy levels can hold __electrons.

• 2,2

• 8,2

• 8,8

• 2, 8

The electrons found in the highest energy level that are furthest from the nucleus in the outermost level are called the ____ electrons.

• atomic

• valence

• energy

• isotope

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Atoms with _______ electrons in the valence shell (highest level, most outer shell) are the most stable.

• 6

• 12

• 2

• 8

The smallest particle of an element that cannot be broken down further without changing the properties of the element.

• cell

• atom

• charge

• isotope

Tags

NGSS.MS-PS1-1