Unit 4B Study Guide Review

Which statement best describes the electrons in this illustration?

• The electrons are negatively charged particles located inside the nucleus

• The electrons are positively charged particles located inside the nucleus.

• The electrons are negatively charged particles located outside the nucleus.

• The electrons are positively charged particles located outside the nucleus.

Tags

NGSS.MS-PS1-1

What is the most basic building block of matter?

• electrons

• protons

• quarks

• atoms

Tags

NGSS.MS-PS1-5

Which part of an atom has a negative charge?

• electron

• proton

• neutron

• nucleus

Tags

NGSS.MS-PS2-3

Which option best describes the mass of an electron?

• higher than the mass of the proton or the neutron

• equal to the mass of the proton and the neutron

• not significant to the overall mass of the atom

How many protons are in this atom if it has a balanced charge?

• 0 protons

• 2 protons

• 4 protons

• 6 protons

Tags

NGSS.MS-PS1-1

What does the electron cloud model describe?

• the group of protons that are in the nucleus

• location where an electron has the highest probability of being found

• the negative charge of the electron

• the neutron orbital

What is the atomic number of an oxygen atom with 8 protons and 10 neutrons in its nucleus?

• 8

• 10

• 18

• not enough info to calculate

Tags

NGSS.MS-PS1-1

What happens if an atom loses a neutron?

• Its mass stays the same, and it becomes a different element.

• Its mass is lowered, and it becomes a different element.

• Its mass stays the same, and it is still the same element.

• Its mass is lowered, but it is still the same element.

Which term is defined as a substance that cannot be broken down chemically into a simpler substance?

• atom

• element

• molecule

• compound

Which term is defined as the sum of protons and neutrons in an atom?

• mass number

• atomic number

• charge number

• balance number