periodic table, stable & unstable atoms

11-Is a simple way to show how the valence electrons are arranged in the outer shell.

19-Oxygen atom has 4 valance electrons

10-The no. of valence electrons for group 18 is........... except helium has ...............

9-The no. of valence electrons for 15 is..............

13-The atom is chemically ..................if all dots are paired in Lewis structure

17-This is the correct dot diagram for sodium (Cl) which found in group 7

2-------------the horizontal rows in the periodic table

14-The atom is chemically ....................if some of the dots are unpaired in Lewis structure so it can form .....................with another atom

4-The valence electrons of the atom participate in chemical bonding.

16-How many valence electrons does Chlorine (Cl) have? Remember carbon in group 117

20-This is a correct dot diagram for oxygen (O) which is found in group 16 , it can form 2 bond with another atom

8-The number of valence electrons in an atom equals the ones digit of the group number.

3-the electrons in the outer energy level is called ............

5-The Periodic table includes 7 periods and 18 groups

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.

1-The vertical column on the periodic table………………………………………

15-The number of unpaired dots in Lewis structure = ..................... a-chemical reaction with another atom    b-number of bonds an atom can form.

12-in Lewis structure, valence electrons are put as Dots one-by-one around the element's symbol

18-the number of unpaired electrons in fluorine is .........and the number of bond that can form is......... with another atom