Atomic Structure

What is the atomic number?

• The number of protons in an element
• The number of neutrons in an element
• The number of protons and neutrons.
• The number of electrons.

What is the atomic number of an element with 12 protons, 13 neutrons and 12 electrons?

• 12
• 13
• 25
• 24

Changing the number of electrons in an atom changes its...

• element type.
• charge.
• isotope type.
• atom type.

Tags

NGSS.MS-PS1-1

Electrons have virtually no mass (weight).

• True
• False

Tags

NGSS.MS-PS1-1

How many protons are in an atom of carbon?

• 12
• 8
• 6
• 14

How many electrons does a neutraly charged carbon atom have?

• 0
• 2
• 14
• 6

What parts of the atom make up most of its mass?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons

What is the mass of a proton?

• about 1/1800th of an amu
• 0 amu
• 1 amu
• 2/3 amu

Tags

NGSS.MS-PS1-1

Where are electrons located in an atom?

• inside the nucleus
• electron cloud
• outside space-time
• Oort cloud

If you alter the number of neutrons in an atom, what do you create?

• ions
• isotopes
• atoms
• radioactivity