Review Quizizz

Which phrase describes the nucleus of any atom?

• has an overall positive charge

• has an overall negative charge

• contains negative electrons

• contains positive electrons

Which proposal in the development of the modern model of the atom was made before the others?

• Atoms are hard, indivisible spheres of different sizes.

• Atoms are mostly empty space with a small dense nucleus.

• Atoms have electrons that have wavelike properties.

• Atoms have an internal structure that contains negative particles.

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

• 0

• –2

• +8

• +16

The table below gives the atomic mass and the abundance of the two naturally occurring isotopes of copper. Which numerical setup can be used to calculate the atomic mass of the element copper?

• (62.93 u)(30.85) + (64.93 u)(69.15)

• (62.93 u)(69.15) + (64.93 u)(30.85)

• (62.93 u)(0.3085) + (64.93 u)(0.6915)

• (62.93 u)(0.6915) + (64.93 u)(0.3085)

If two atoms are isotopes of the same element, the atoms must have

• the same number of protons and the same number of neutrons

• the same number of protons and a different number of neutrons

• a different number of protons and the same number of neutrons

• a different number of protons and a different number of neutrons

Which notations represent hydrogen isotopes?

• ¹H and ²H

• ¹H and ⁴₂H

• ¹H and ¹₃H

• ²₁H and ⁷₂H

An orbital is defined as a region of the most probable location of

• an electron

• a neutron

• a nucleus

• a proton

Compared to an electron in the first electron shell of an atom, an electron in the third shell of the same atom has

• less mass

• less energy

• more mass

• more energy

Diagram 1 represents an atom of hydrogen, showing the nucleus and the electron in the first shell.

• a positive ion of hydrogen

• a negative ion of hydrogen

• an atom of hydrogen in an excited state

• an atom of hydrogen in the ground state

Which electron configuration represents the electrons of an atom in an excited state?

• 2-7-3

• 2-8-2

• 2-8-8-1

• 2-8-9-2