Vocabulary
Periodic Table
Subatomic Particles
Isotopes
Ions
100
__________ ____________ is the number of protons plus the number of neutrons in an atom.
mass number
100
How many protons does an atom of chlorine have?
17
100
this subatomic particle was discovered on accident by the cathode ray tube. It has a negative charge and resides outside the nucleus.
electron
100
Isotopes of atoms have the same number of ________ and different _______ ___________.
protons; mass numbers
100
An ________ is an atom that has gained or lost electrons.
ion
200
__________________ ___________________ is equal to the number of protons an atom has. We use this number to identify atoms.
atomic number
200
The element Hf is named ____________, and it has __________ protons.
hafnium; 72
200
An isotope of rubidium (Rb) has a mass number of 85. How many protons does this isotope have? How many neutrons?
37 protons; 48 neutrons
200
An isotope of sodium-24 has __________ neutrons.
24-11 = 13 neutrons
200
When an atom gains electrons, it forms a ___________ ion.
negative
300
__________________ ___________________ is equal to the number of protons and the number of electrons for a neutrally charged element (NOT protons plus electrons).
atomic number
300
An atom of nitrogen ALWAYS has 7 ___________.
protons
300
These two subatomic particles are what make up all of the mass of the atom.
protons and neutrons
300
If hydrogen's average atomic mass is 1.00795 amu, this means that the _______________ isotope is most abundant.
Hydrogen-1
300
When an atom loses electrons, it forms a ___________ ion.
positive
400
If an atom has more protons than electrons, the ion formed has a __________ charge.
positive
400
Which element on the periodic table has the element symbol of Hg? What is this element's atomic number?
mercury (Hg)
atomic number: 80
400
for the isotope zinc-65, give the atomic number, number of protons, number of neutrons, and mass number
30; 30; 35; 65
400
This isotope of potassium has ____ neutrons.
21
400
S-2 has ________ electrons.
18 electrons.
500
If an atom has less protons than electrons, the ion formed has a __________ charge.
negative
500
An atom of an element has 22 protons and 28 neutrons. What is the mass number? What is the identity of this element?
mass number: 50
identity: titanium
500
How do I find an atom's number of neutrons?
Neutrons = mass number - atomic number
500
A neutral atom of neon (Ne) has _______ protons and _________ electrons.
10; 10
500
Magnesium loses 2 electrons. What is the charge on the ion formed?
Mg+2