8th grade

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

Which two subatomic particles make up the nucleus of an atom?

• Protons and Electrons
• Neutrons and Electrons
• Electrons and Protons
• Protons and Neutrons

Tags

NGSS.MS-PS1-1

a positively chargd particle found in the nucleus of an atom

• electron cloud

• proton

• electron

• neutron

An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

The elements in this group only have 1 valence electron and include Li, Na, and K. 

• Group 11
• Group 1
• Group 3

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The total number of protons and neutrons in an atom represent the __________________ of an atom.

• mass number
• atomic mass number
• isotopes
• electron cloud

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3
• 6
• 12
• 24

How many Hydrogen atoms are in H₂O?

• zero
• one
• two
• three

How many atoms are there TOTAL in:
H₂SO₄

• 6
• 5
• 7
• 3

How many Aluminum are in Al₂O₃?

• 3
• 2
• 5