Chemistry Unit 3- Atomic Structure

What is the total number of protons and neutrons in the nucleus of an atom?

• Ion

• Atomic Number

• Atomic Mass

• Mass Number

What is the weighted average of the masses of the isotopes of an element?

• Atomic Number

• Mass Number

• Atomic Mass

• Isotope Number

What is the central part of the atom that contains protons and neutrons?

• Center

• Electron Cloud

• Nucleus

• Procleus

Which subatomic particle has no charge?

• Proton

• Neutron

• Electron

• Quark

Who first came up with the idea of the atom?

• Democritus

• Dalton

• Rutherford

• Mr. Brown

Who discovered the electron with the use of a cathode ray?

• Dalton

• Thomson

• Mendeleev

• Mr. Stock

J.J. Thomson's atomic model is known as the

• Planetary Model

• Pizza Model

• Perfect Atom Model

• Plum Pudding Model

Tags

NGSS.MS-PS1-1

The gold foil experiment, which discovered that the atom was mostly empty space with a positive nucleus, was performed by ____?

• Thomson

• Crookes

• Rutherford

• Mendeleev

Tags

NGSS.HS-PS1-8

What is the relationship between ¹²₆C and ¹⁴₆C ?

• Ions

• Same atom

• Allotropes

• Isotopes

What is the mass number of Sulfur-44?

• 44

• 18

• 4.4

• 32

Tags

NGSS.HS-PS1-8