STRUCTURE OF ATOM

What is at the center of every atom?

• An electron
• A compound
• A molecule
• A nucleus

Tags

NGSS.HS-PS1-8

The particles with no charge in an atom are the _______.

• electrons
• neutrons
• protons
• protons and neutrons

Tags

NGSS.MS-PS1-1

• Nucleus, positive
• Nucleus, negative
• Nucleus, neutral
• Electron Cloud, positive

Tags

NGSS.MS-PS1-1

How many protons are there in an atom of aluminium?

• 27

• 13

• 14

• 17

Tags

NGSS.MS-PS1-1

What are valence electrons?

• electrons on the first orbital always
• nucleus
• the outermost shell
• the number of electrons on the outermost orbital

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons
• 8 protons
• 8 neutrons
• a mass number of 8

Tags

NGSS.MS-PS1-1

99.9% of the atom's mass is found where?

• nucleus

• protons

• electron cloud

• neutrons

Tags

NGSS.MS-PS1-1

Rutherford concluded that the amount of positive charge varies

• with the amount of electrons in the nucleus.

• as the the amount of isotopes varies.

• with the amount of neutrons in the nucleus.

• with different elements.

Tags

NGSS.HS-PS1-8

Neutrons have almost exactly the same mass as

• electrons.

• positrons.

• protons.

• quarks.

Tags

NGSS.HS-PS1-8

James Dalton proved that the true nature of the atom could best be described as resembling "plum pudding."

• True

• False

Tags

NGSS.MS-PS1-1