Subatomic Particles
The negatively charged subatomic particle is called.....
electron
How are elements in the modern periodic table ordered?
By atomic number
What is an ion?
An atom that has lost or gained electrons
How many electrons can the second & third shell hold?
8
Approximately how many elements are there?
100
What are the three sub-atomic particles that make up an atom?
Protons, neutrons and electrons
What are periods in the periodic table?
The rows in the periodic table
If an atom has gained electrons, what charge will it have?
Negative
The number of energy levels in Potassium.
4
Why did Mendeleev leave gaps in his periodic table?
For elements that had not been discovered yet
Particles that gives atom its mass
neutron, proton
What are groups in the periodic table?
The columns, numbered 1, 2, 3, 4, 5, 6, 7, 0
If an atom has lost electrons, what charge will it have?
Positive
The electron configuration of Silicon
2.8.4
In which group are halogens on periodic table?
Group 17 (also known as Group VIIA)
What is the relative charge of a neutron?
0
What are the group 1 metals called?
Alkali metals
What charge do ions formed from group 1 elements have?
1+
What can the group tell you about the electrons in an atom?
How many electrons in the outer shell. E.g. carbon is in group 4 so has 4 electrons in the outer shell
Name of the element with 7 protons
Nitrogen
What is ‘atomic number?’
The number of protons in an atom
How are elements in the same group similar to each other?
They all have similar chemical properties
What charge do ions formed from group 6 elements have?
2-
What can the period tell you about the electrons in an atom?
How many shells an atom has. E.g. carbon is in the second period so has two shells.
The electrons in the outermost energy shell of an atom that are involved in forming chemical bonds.
Valence electrons