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
Three subatomic particles of an atom
Protons, neutrons and electrons
Periods on the periodic table are arranged this way
Rows/horizontally
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
If an atom has lost electrons, what charge will it have?
Positive
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
Relative charge of a neutron
0
What are the group 1 metals called?
Alkali metals
What charge do ions (atoms) form from group 1 elements have?
1+
Bromine is in group 4, column 17. It has this many energy levels
4
Phosphorus is in column 15, it has this many valence electrons
5
Particles that gives atom its mass
Neutrons and protons
Mendeleev organized the periodic table based on this
Atomic Mass
What charge do ions formed from group 6 elements have?
2-
Based on the periodic table this is the maximum number of energy levels
7
Number found IN FRONT of a molecule
Coefficient