Chemistry Review

Which statement is true about oxygen-17 and oxygen-18?

They are isotopes of oxygen

For the element Nitrogen, the number 14.007 is defined as the ___ of that element.

atomic mass

To find the number of neutrons in an atom, you would subtract?

atomic number from mass number

In an atomic model, that includes a nucleus, positive charge is?

concentrated in the center of an atom

The region in which an electron is most likely to be found is called a(an) ____

electron

When an atom gains or loses energy, some of its ____ may move between energy levels

electron

Which of the three subatomic particles-- proton, electron, or neutron--has the least mass?

electron

Protons and ___ neutrons are found in the nucleus of an atom

neurtons

The difference between a sample of heavy water and regular water is that a hydrogen atom in heavy water has an extra ____

neutron

The nuclei of isotopes contain different numbers of ___

neutrons

If element Q has 11 protons, its atomic ___ is 11

number

Neurtons and ____ have almost the same mass

protons

Which statement about subatomic particles is NOT true?

protons and neutrons have the same charge

Identify if the following pairs of elements are different elements (DE) or isotopes (I).____

(DE), Orbital

If an atom of an element has a mass number of 32 and 20 neutrons in its nucleus, what is the atomic number of the element?

12

If an atom of tin has a mass number of 118 and an atomic number of 50, how many neutrons are in its nucleus?

68

if an atom has 34 protons and 40 neutrons, what is its mass number?

74

What is the maximum number of electrons that the second energy level can hold?

8

Which statement about subatomic particles is true?

An electron has far less mass than either a proton or neutron

Which subatomic particle has a negative charge?

Electron

What is the difference between an atom in the ground state and an atom in an excited state?

The atom in an excited state has more energy and is less stable than the atom in the ground state.

Suppost an atom has a mass number of 23. Which statement is true beyond any doubt?

The number of protons in the nucleus does not equal the number of neutrons.

Which of the following is unique for any given element?

The number of protons

In Bohr's model of an atom, ____ move in fixed orbits around the nucleus

electrons

Most calcium atoms have ann atomic number of 20 and a mass number of 40, but some calcium atoms have a mass number of 48.. what word could you use to describe these two kinds of calcium atoms?

isotopes

The ____ of an isotope is the sum of the number of protons and neutrons in its nucleus

mass number