First half of unit 2

Value representing the number of protons in an element

• Atomic Mass
• Mass Number
• Valence Electrons
• Atomic Number

Which subatomic particles are found in the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Neutrons and Electrons
• Protons, Neutrons and Electrons

Tags

NGSS.MS-PS1-1

Atoms of the same element must always have the same number of _________

• electrons
• neutrons
• isotopes
• protons

The mass number of an element that has18 protons, 18 electrons, and 19 neutrons is _____.

• 12.5
• 13
• 25
• 37

Tags

NGSS.MS-PS1-1

What element is represented in this Bohr Model? 

• Carbon
• Hydrogen
• Aluminum
• Lithium

Tags

NGSS.HS-PS1-1

Who believed that electrons were scattered amongst positively charged material.

• JJ Thomson
• Ernest Rutherford
• John Dalton
• Niels Bohr

Tags

NGSS.HS-PS1-3

Discovered that the atom has a small, dense, positively charged nucleus.

• Ernest Rutherford
• Heisenberg
• Democritus
• JJ Thomson

Tags

NGSS.HS-PS1-8

The following picture represents which atomic model?

• Niels Bohr
• Democritus
• Schrodinger & Heisenberg
• JJ Thomson

Tags

NGSS.MS-PS1-1

Which statement about electrons is true?

• Electrons circle the nucleus of the atom
• Electrons have a positive charge
• Electrons have a mass of 1 amu
• Electrons exist in the nucleus of the atom

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What do these isotopes of carbon all have in common?

• neutrons & mass number
• atomic number and neutrons
• atomic number and electrons
• protons, atomic number, and mass number

Tags

NGSS.MS-PS1-1