A combination of atoms is called a ___.

• molecule
• element

• ion

• mixture

Tags

NGSS.MS-PS1-1

An atom is the smallest particle of matter that has all the ​ (a)   ​ properties of a given element.

• chemical
• physical
• compound
• mixture

Solids, liquids and gases are formed when molecules interact.

• true

• false

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

The ___ is the subatomic particle in an atom which carries a positive charge. ​ (a)  

• electron
• neutron
• proton

The ___ is the subatomic particle in an atom which carries a neutral charge. (a)  

• neutron
• proton
• electron

The ___ is the subatomic particle in an atom which carries a negative charge. (a)  

• electron
• proton
• neutron

The mass of a proton is ___ amu.

• 1
• 0

• 2

• 10

The mass of a neutron is ___ amu.

• 1
• 0

• 2

• 10

The mass of an electron is ___ amu.

• 0
• 1

• 2

• 10

Tags

NGSS.MS-PS1-1

The outer region of the atom is called the "electron shells" or "​ (a)   ".

• nucleus
• isotope
• net charge
• cloud