Eighth Grade Science STAAR Review

An atom with atomic number 6 would have how many protons?

• 6

• 12

• 3

• cannot be determined

Tags

NGSS.MS-PS1-1

Particles in an atom that are neutral and have no charge are -

• negatrons

• electrons

• neutrons

• protons

If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?

• 10
• 20
• 30

Tags

NGSS.MS-PS1-1

If the mass number of this chlorine atom is 36, how many neutrons does it have?

• 17

• 18

• 19

• can't be determined

Tags

NGSS.MS-PS1-1

What is the mass number of the atom shown in the Bohr model?

• 11

• 12

• 23

• Can't be determined

Tags

NGSS.MS-PS1-1

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

The horizontal (side to side) rows in the Periodic Table are called

• groups

• families

• periods

• atomic numbers

The substances listed on the right side of a chemical equation are the

• Yields
• Reactants
• Products
• Precipitates

How many Oxygen (O) atoms are in 2C₂HO₈C_l2

• 2
• 16
• 8
• 5

Tags

NGSS.MS-PS1-1

How many atoms of Carbon are in the following formula? 3C₂H₆

• 3

• 6

• 12

• 18

Tags

NGSS.MS-PS1-1