The atom review covid

What is the mass of an atom that has 25 protons, 35 electrons, and 25 neutrons?

• 60 amu

• 50 amu

• 10 amu

• 25 amu

How many neutrons are in C-14?

• 6

• 7

• 8

• 14

What electron configuration represents a sodium atom in an excited state?

• 2-7-2

• 2-7-1

• 2-8-1

• 2-8-2

How many electrons are in an atom with 4 protons and 6 neutrons?

• 2

• 10

• 6

• 4

What charge do electrons have and where are they located?

• positive, nucleus

• positive, electron shell

• negative, nucleus

• negative, electron shell

The mass of a neutron is equal to the mass of

• an electron

• a proton

• an alpha particle

• a beta particle

What is the charge of the nucleus of an aluminum atom?

• +27

• +13

• -13

• 0

If a calcium atom loses two electrons it becomes a

• positive ion with a smaller radius

• positive ion with a larger radius

• negative ion with a smaller radius

• negative ion with a larger radius

An ion consists of 8 protons, 9 neutrons, and 7 electrons has a net charge of

• -2

• -1

• +1

• +2

What identifies an element?

• mass number

• atomic number

• number of electrons

• charge