Chemistry Midterm Review

Which two subatomic particles make up the nucleus of an atom?

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

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NGSS.HS-PS1-8

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20

• 10

• 35

• 25

This could be the dot diagram of

• Mg

• Cl

• C

• O

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

• 31

• 5

• 15

• 4

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NGSS.HS-PS1-1

What is the excited state electron configuration of Sodium, Na

• 1

• 2-8-1

• 2-7-1

• 2-7-2

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NGSS.HS-PS1-1

The energy of an electron __________ as it moves further away from the nucleus

• increases
• decreases

Light is emitted when electrons ...

• return from high energy state to low energy state

• jump from low energy state to high energy state

• either of these

• none of these

Tags

NGSS.HS-PS4-3

The atomic mass of an element is the ___.

• average of the mass number and the atomic number for the element

• weighted average of the masses of the isotopes of the element

• total mass of the isotopes of the element

• total number of subatomic particles in the nucleus

How many neutrons in C-14?

• 6
• 7
• 14
• 8

In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  

• Atoms are small indivisible spheres
• Atoms are mostly empty space with a small, dense, positive center
• Atoms have negatively charged particles which orbit the nucleus
• Light is a wave, not a particle

Tags

NGSS.MS-PS1-1