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periodic table, stable & unstable atoms
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20-This is a correct dot diagram for oxygen (O) which is found in group 16 , it can form 2 bond with another atom
True
19-Oxygen atom has 4 valance electrons
False
18-the number of unpaired electrons in fluorine is .........and the number of bond that can form is......... with another atom
one - one
17-This is the correct dot diagram for sodium (Cl) which found in group 7
True
16-How many valence electrons does Chlorine (Cl) have? Remember carbon in group 117
7
15-The number of unpaired dots in Lewis structure = ..................... a-chemical reaction with another atom    b-number of bonds an atom can form.
both
14-The atom is chemically ....................if some of the dots are unpaired in Lewis structure so it can form .....................with another atom
unstable -bond
13-The atom is chemically ..................if all dots are paired in Lewis structure
stable
12-in Lewis structure, valence electrons are put as Dots one-by-one around the element's symbol
true
11-Is a simple way to show how the valence electrons are arranged in the outer shell.
electron dot diagram ( Lewis structure )
10-The no. of valence electrons for group 18 is........... except helium has ...............
8 - 2
9-The no. of valence electrons for 15 is..............
5
8-The number of valence electrons in an atom equals the ones digit of the group number.
true
7-It is a row of the periodic table, where the atomic number of each element increases by one from left to right.
7-It is a row of the periodic table, where the atomic number of each element increases by one from left to right.
6-It is a column on the periodic table, where the atomic number of each element increases by eight from up to down.
Group ( family )
5-The Periodic table includes 7 periods and 18 groups
true
4-The valence electrons of the atom participate in chemical bonding.
True
3-the electrons in the outer energy level is called ............
Valence electrons
2-------------the horizontal rows in the periodic table
Period
1-The vertical column on the periodic table………………………………………
Group
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