Building Blocks of Matter
The smallest unit of matter is...
Atom
The center of an atom is called...
Nucleus
This is the chemical symbol for hydrogen.
H
How many oxygen atoms are in this chemical formula?
O2
2
This is one or two letters that represent an element on the periodic table.
Chemical symbol
A pure substance that is made up of only one kind of atom is called...
Neutrons have this kind of charge.
Neutral/No charge
This is a table on which all of the known elements are arranged.
Periodic table
How many hydrogen atoms are in this formula?
2 OH
2
This is the number that tells us how many molecules there are.
Anything that has mass and takes up space is called...
Matter
The positive charged particles in the nucleus are called...
Protons
This is the chemical symbol for oxygen.
O
How many sulfur atoms are in this formula?
SO4
1
This is the number that tells us how many atoms of an element are in a molecule.
Subscript
A group of two or more atoms bonded together is called...
Molecule
The negative charged particles in an atom are called...
Electrons
This is the chemical symbol for iron.
Fe
How many hydrogen atoms are in this formula?
2 C6H12O6
12
The atomic number tells us how many ______ there are in an atom.
Protons
A molecule that is made up of two or more different elements is called...
Compound
The area outside the nucleus where negative charged particles are found is called the...
Electron cloud
Elements on the periodic table are arranged by what?
Atomic number
How many oxygen atoms are in this formula?
2 Ca(OH)2
4
The atomic mass tells us how many ___________________ there are in an atom (2 answers)
Protons and neutrons