1. ANSWERS to Activity 1.3.4 Qs 1-13 (pg 70-71)

2. 1 electron in their outer shell
What do the atoms of all of the Group 1 elements have in common?
2. How does the number of electrons change as you move from atom to atom across a row?
1 electron in their outer shell
It goes up by 1

3. 1 more ring is added 4 7 Both go up by 1
How does the arrangement of the electrons change as you move down the columns?
How many shells of electrons does bromine have?
4b. How many electrons in bromine’s outermost shell?
5. What happens to the electron count and the number of shells when you move from neon, Ne, to sodium, Na?
1 more ring is added 4 7
Both go up by 1

4. What group is thallium, Tl, in
What group is thallium, Tl, in? How many electrons will it have in its outermost shell?
How many valence electrons does the element Se, selenium, have? What about Na, sodium?
How many valence electrons do the halogens have? The noble gases?
3A, 3 electrons
6, 1
7, 8

5. How many core electrons does the element O, oxygen, have
How many core electrons does the element O, oxygen, have? What about neon, Ne?
How many core electrons does potassium, K, have? What about germanium, Ge? What about bromine, Br?
If an atom has four shells containing electrons, what row is it in?
2, 2
18, 28, 28
Period 4

6. 5, it will have 1 electron Spokes!
How many electron shells do you think Rb, rubidium, will have? What will its outermost shell look like?
Recall the periodic table card sort that you did. How were the valence electrons represented on these cards?
5, it will have 1 electron
Spokes!