Atomic Structure Quiz--Good Pic Explanations Afterward

What is the center of an atom called?

• Electron cloud

• Nucleus

• Proton

• Neutron

Answer explanation

Nucleus!!

Just like a cell has a nucleus, too.

Nucleus means the center.

Tags

7.PS1.1

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

• Electrons and protons

• Protons and neutrons

• Electrons and neutrons

• Protons, neutrons, and electrons

Answer explanation

Nucleus= protons and neutrons

Tags

7.PS1.1

What is the atomic number of an element?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The total number of protons and neutrons in the nucleus

• The total number of protons and electrons in an atom

Answer explanation

Atomic number is the number of protons.

and the number of electrons if the element is "neutral"

Neutral is when there is exactly the same number of positive and negative charges to balance out the attraction forces.

Tags

NGSS.MS-PS1-1

How is the periodic table arranged?

• By increasing atomic mass

• By increasing atomic number

• By decreasing atomic number

• By decreasing atomic mass

What is the mass number of an atom?

• The number of protons

• The number of neutrons

• The total number of protons and electrons

• The total number of protons and neutrons

Answer explanation

Mass Number = All particles in NUCLEUS

Protons + Neutrons = Mass Number

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

• Atomic number minus atomic mass

• Atomic mass minus atomic number

• Atomic number plus atomic mass

• Atomic mass plus atomic number

Answer explanation

Round the atomic mass first to the nearest whole number. Then do what it shows in the picture.

What is atomic mass?

Hint: it is the number with a

decimal that is larger than the atomic number.

• The mass of an electron

• The mass of a proton

• The average mass of all the isotopes of an element

• The mass of a neutron

Answer explanation

It is an AVERAGE of the mass of all known ISOTOPES of that element.

That is why there is a decimal instead of whole number.

Tags

NGSS.MS-PS1-1

Which subatomic particle has a negative charge?

• Proton

• Neutron

• Electron

• Nucleus

Answer explanation

Electrons are (-) & attracted to protons (+)

Electron (-) and Electron (-) push each other away or repel.

Which subatomic particle has a positive charge?

• Proton

• Neutron

• Electron

• Nucleus

Answer explanation

Protons are POSITIVELY Charged

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What sizes are the subatomic particles?

• The proton and neutron are of similar size, but electrons are 1,836 times larger

• The electron and neutron are of similar size, but protons are 1,836 times smaller

• The neutron and proton are of smallest sizes, and electrons are 1,836 times more dense

• The proton and neutron are of similar size, but electrons are 1,836 times smaller

Answer explanation

Electrons are 1,836 times smaller.

This picture is not nearly correct to that scale.

Protons and Neutrons are of similar size.