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Periodic Table
Parts of an Atom
Counting Atoms
Matter and Energy
Atomic Numbers
100

This family on the periodic table does not react.

noble gases

100
The inner part of an atom that contains the proton and the neutron is called the __________.
Nucleus
100

How many atoms of oxygen are in each CO2 molecule?

2
100
This is anything that takes up space (has a mass).
matter
100

The atomic number of an atom is the same as the number of what in that atom?

protons

200

The largest family in the middle of the table

transition metals

200
These particles have a positive charge and are found inside the nucleus.
proton
200
For a chemical reaction to be balanced, the reactants must equal the __________.
Products
200
The smallest pieces of matter are called __________.
atoms
200
Carbon's atomic number is _______.
6
300

The father of the Periodic Table...

Dmitri Mendeleev
300
These particles are located within the nucleus, and have no charge.
Neutron
300

How many hydrogen atoms are in 5 molecules of H2O?

10

300

Which state of matter has the fastest moving particles? Solid, liquid, or gas?

gas

300
What element has a number of 56?
barium
400

The periodic table is organized by increasing...

atomic number
400
These particles are negatively charge and are found outside the nucleus.
electrons
400
The number of atoms in a molecule determines the _______________ of a substance.
properties
400

When a chemical reactions causes a liquid to cool down, it is a ___________ reaction.

endothermic

400
Why does hydrogen have an atomic number of 1?
because it only has one proton
500
How many elements on the periodic table are found in nature?

92

500
Most of the mass of an atom is located here.
nucleus
500

In a chemical reaction, atoms are not created or ______________.

destroyed

500

When energy is released by a chemical reaction, it is an _________________ reaction.

exothermic

500

Some atoms have more ___________, which give them an overall negative charge.

electrons