8th Grade Science - Matter at the Atom Level

The smallest particle into which an element can be divided and still be the same element id the ___________.
Electrons are ____________ charged particles inside the atom.
1. neutral
2. negatively
3. positively
The positively charged part of the atom is the _____________.
Most of the space in an atom is taken up by the:
1. nucleus
2. electrons
3. electron clouds
4. protons
Which particles contribute most to the mass of an atom?
(Check all that apply.)
1. protons
2. neutrons
3. electrons
The atomic number of an atom is equal to the number of __________ found in the atom.
1. neutrons
2. electrons
3. protons
Isotopes of the same element have the same number of ____________, but a different number of ____________.
(Pick the combination of terms below that go into the blanks in the order given.)
1. protons, neutrons
2. neutrons, protons
3. electrons, protons
4. protons, electrons
The sum of the protons and neutrons in an atom is its _________ _____________.
The weighted average of the masses of all the naturally occurring isotopes of that element is its __________ ____________.
The force in an atom that prevents the protons in an element with two or more protons from flying apart is the:
1. weak force
2. electromagnetic force
3. strong force
4. gravitational force
The property of an element that is used to arrange elements in the Periodic Table is the ________ __________.
A horizontal row of elements in the Periodic Table is called a ___________ .
The elements in a group of elements in the Periodic Table
1. have physical and chemical properties that follow a repeating pattern as you move down the group.
2. have similar physical and chemical properties within the group.
The Carbon Group in the Periodic Table contains all non-metals.
1. True
2. False
_______________ is the element whose properties do not match the properties of any single Group in the Periodic Table.