Electrons, Protons, Neutrons
Protons and neutrons located in where?
Nucleus
1st energy level can hold a maximum of how many electrons?
2
what are Groups
The columns of elements Numbers 1-18 and all of the elements in the group have the same number of electrons in the valence electron?
What is an isotope
atoms of the same element that have different numbers of neutrons
How do you find the mass number?
You add the protons and neutrons.
Electrons closest to the nucleus have low or high energy?
Low Energy
2nd energy level can hold a maximum of how many electrons?
8
What Are Rows
indicates the number of energy levels / orbitals
How many elements on the periodic table and how many are found on earth and in labs?
118
90 on Earth
28 on Earth
The number of protons is equal to the number of...
neutrons
Electrons furthest have
High Energy
3rd energy level can hold a maximum of how many electrons?
18
What is a Proton?
particles with a charge of 1+. They have the mass of 1 amu.
how many dots should be on the following element?
Pt78 with a valence number of 1
1
What is the amu for protons?
1 amu
What is a Neutron
particles that have no charge and a mass of 1 amu.
4th energy level can hold a maximum of how many electrons?
32
What is a quark?
particles of matter that make up protons and neutrons
how many dots should be on the following element?
Pb82 with a valence electron count of 4
4
What is the amu for neutrons
0 amu
What is an electron?
particles with an electric charge of -1 that exist in an electron cloud that surrounds the nucleus.
How many energy levels can possibly hold electrons?
7
What is an Electron cloud?
the area around the nucleus of an atom where the atoms electrons are most likely to be found.
how many dots should be on the following element?
At85 with a valence electron count of 7
7
what is the amu of a electron
-1