Science STAAR

What is atomic number?

• Number of protons in an atoms 
• Number of neutrons in an atom
• Mass of an atom
• Charge on an atom

Which subatomic particles are found in the nucleus of an atom?

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

What electrical charge does a proton have?

• +1
• 0
• -1
• +2

The total number of protons and neutrons in an atom is called the...

• Atomic number
• Proton number
• Mass number
• Weight number

Complete the missing label on the diagram.

• Neutron
• Centre
• Nucleus
• Sub atomic particle

Tags

NGSS.MS-PS1-1

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

• mass number

• atomic number

• atomic weight

• isotope weight

The _________ of an element equals the number of protons in an atom of that element

• mass number
• atomic weight
• atomic number
• isotopes

The only subatomic particle that carries a positive charge is the _____.

• electron
• nucleus
• neutron
• proton

An atom has 10 protons and a mass of 18. It has __ neutrons

• 10
• 18
• 28
• 8

Tags

NGSS.MS-PS1-1

Hydrogen has 1 proton. It's atomic number is:

• 0
• 1
• 2
• cannot be determined