Subatomic Particles
The negatively charged subatomic particle is called.....
electron
How are elements in the modern periodic table ordered?
By atomic number
This bond shares electrons
Covalent bond
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 Hydrogen
1
Why did Mendeleev leave gaps in his periodic table?
For elements that had not been discovered yet
Electrons in the outermost shell
valence electrons
Groups on the periodic table tell you this when needing to bond elements together
number of valence electrons
2 Electrons are lost when magnesium bonds with oxygen, therefore magnesium has this charge
+2
Silicon has 14 electrons, how many electrons shells does it have?
3 (2,8,4)
In which group are noble gases on periodic table?
Group 18
What is the relative charge of a neutron?
0
What are the group 1 metals called?
Alkali metals
Metals do this with their valence electrons in an ionic bond.
lose
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
Phosphorus is in column 15, it has this many valence electrons
5
Particles that gives atom its mass
Neutrons and protons
How are elements in the same group similar to each other?
They all have similar chemical properties
For an ionic bond, group 16 would have this charge when bonded with other elements.
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.
Number found IN FRONT of a molecule
Coefficient