ATOMS
The smallest unit of matter.
What is an atom?
The atomic number tells you this
What is the number of protons?
The particle that determines the atoms identity.
What is the proton?
the coefficient tells you this in a chemical equation.
The Law of Conservation of Mass says matter cannot be _________ or __________.
What is created or destroyed?
The three particles that make up an atom.
What is proton, electron and neutron?
What is sodium?
The particle that has a negative charge.
What is the electron?
This must be the same on both sides of a balanced equation.
What is the number of each type of atom?
What is the nucleus?
The group # for the Noble Gasses.
What is 18 or 8?
What is 2?
Balance:
H2 + O2 --> H2O
What is
2H2 + O2 --> 2H2O
Chemical equations must be balanced because of this law.
What is the Law of Conservation of Mass?
This scientist proposed that atoms are small, solid spheres.
Who is John Dalton?
The most reactive element in Group 1.
What is Francium?
what is subtract the mass number from the atomic number?
The number of Cl atoms in this equation on each side:
2Na + Cl2 --> 2NaCl
What is 2?
A charge of an ion with more electrons than protons is ________.
What is negative?
These types of atoms of the same element have different numbers of neutrons are called this.
What is an isotope?
Elements are arranged in rows called______, and columns called________.
What is periods, and groups/families?
This model describes electrons as moving in a cloud around the nucleus.
True or False:
Subscripts can be changed to balance an equation.
What is FALSE
When this changes, an atom becomes an isotope.
What is the number of neutrons?