Atoms & the Periodic Table

All atoms of the same element have the same number of ___________.

• protons

• neutrons

• electrons

• protons and neutrons

Tags

NGSS.MS-PS1-1

The atomic number of an element indicates the number of which subatomic particle in the atom?

• neutrons

• protons

• electrons

• atomic mass

Which subatomic particle is the least massive?

• proton

• neutron

• electron

Describe the charge and location of the electron.

• negative charge, located in the nucleus

• negative charge, located in energy levels surrounding the nucleus

• positive charge, located in the nucleus

• neutral charge, located in energy levels surrounding the nucleus

Tags

NGSS.MS-PS2-3

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

• atomic number - mass number = # neutrons

• it is equal to the atomic number

• mass number + atomic number = # neutrons

• mass number - atomic number = # neutrons

The atomic number of magnesium is 12. How many electrons are in an atom of magnesium-25?

• 25

• 13

• 12

• 2

Tags

NGSS.MS-PS1-1

What is the maximum number of electrons that can occupy the second energy level of an atom?

• 2

• 8

• 18

• 32

The majority of the mass of an atom is contained in which location?

• protons

• electron cloud

• neutrons

• nucleus

What is the mass number of uranium-235.

• 92

• 235

• 238

• 242

Tags

NGSS.HS-PS1-8

Which of the statements about electrons is NOT true?

• electrons have a negative charge

• electrons have no mass

• electrons are found in energy levels surrounding the nucleus

• in a neutral atom, the number of electrons equals the number of protons.