Periodic Table
Is a group on the periodic table vertical or horizontal?
Vertical
How many protons are there in Beryllium?
4
How many electrons in the first shell of Chlorine?
Two
Valence electrons
How many elements are there in the first period on the periodic table?
Two, hydrogen and helium
How many electrons in Carbon?
six
8
Why do you have to write the chemical symbol in the middle of a Lewsi dot?
Because there are seveal elements in the same group that have the same number of valence electrons
What does the group number tell you about the elements within it?
How many valence electrons there are in those elements
Name three elements in the same period.
Carbon Oxygen and Beryllium
Boron Lithium Neon
How many electrons are in the third shell for Bromine, atomic number35?
18
Where are the dots in a Lewis dot for helium
ON opposite sides of each other, one dot on each side.
group 8/ Noble gases
How many electrons would Fluorine need for a full valence?
1
Why is the atomic mass usually double the atomic number?
Because it is the sum of the protons and neutrons