Subatomic Particles & Isotopes

Where is an electron located in an atom?

• spinning around the outside of the nucleus

• in the nucleus with protons

• in the nucleus with neutrons

• outside the nucleus with no movement

You will need a periodic table for this question.

Bromine-80 has _____ protons, _____neutrons, _____electrons.

• 45, 35, 35

• 80, 35, 45

• 35, 45, 35

• 80, 35, 35

Tags

NGSS.MS-PS1-1

You will need a periodic table for this question.

Magnesium -25 has a mass number of _____, and atomic number of _____.

• 12, 25

• 12, 13

• 25, 40

• 25, 12

What is the charge of an electron?

• neutral

• negative

• positive

• yet to be determined

Tags

NGSS.MS-PS2-3

What is the charge and location of a proton?

• positive, nucleus

• positive, outside nucleus

• neutral, inside nucleus

• negative, inside nucleus

What is the charge and location of a neutron?

• neutral, outside nucleus

• neutral, nucleus

• negative, nucleus

• negative, outside nucleus

Mass Number is equal to

• electrons + protons

• protons = electrons

• number of neutrons

• protons + neutrons

Which of the following is true in a neutral atom?

• atomic number=protons=electrons

• mass number=atomic mass

• protons=neutrons

• mass number=protons

How do you calculate the number of neutrons in an atom?

• neutrons=mass number

• neutrons=atomic number

• neutrons = mass number-atomic number

• neutrons=protons + electrons

How does the mass of an electron compare to the mass of a proton?

• about 2000 times smaller

• they are equal

• about 10 times larger

• subtract atomic number to calculate