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