Atoms and Isotopes

Which of the following statements regarding subatomic particles is incorrect?

• Protons are positively charged particles and neutrons have no charge.
• The relative mass of the proton, electron and neutron the same.
• In a neutral atom the number of protons equals the number of electrons.
• Isotopes of an element have the same number of protons but a different number of neutrons.

What is the mass number of bromine?

• 35

• 45

• 80

• 79.904

How many neutrons does this bromine atom have?

• 35

• 45

• 80

Tags

NGSS.MS-PS1-1

What is the atomic number of this element?

• 12

• 24

• 23

Tags

NGSS.MS-PS1-1

What is the mass number of this element?

• 12

• 24

• 23

• 11

Tags

NGSS.MS-PS1-1

Isotopes have....(Select ALL that apply)

• same number of protons

• different number of electrons

• same number of electrons

• different number of neutrons

• Same number of neutrons

What does the atomic number identify?

• The number of neutrons of a given atom.

• The number of protons of a given atom.

• The number of neutrons and protons of a given atom.

• The number of electrons of a given atom.

Tags

NGSS.MS-PS1-1

The number of protons + neutrons in an atomic nucleus is referred to as what?

• Atomic number

• Isotope number

• Mass number

Tags

NGSS.HS-PS1-8

Which subatomic particle is used to identify the atom, as it never changes?

• protons

• neutrons

• electrons

Tags

NGSS.MS-PS1-1

How many protons are found in this isotope? ⁷⁵₃₃As

• 75

• 42

• 33

• 108

Tags

NGSS.MS-PS1-1