13. a. row= period b. column= groups
14. sodium (Na) and potassium (K)
15. a. Noble gasses are located in the group all of the way to the right, b. they are monatomic, c. they don't form compounds
16. a. MgF2 b. GaP2
17. The melting point would be around 70 degrees C
18. I would expect it to be lower.
19.
|
Element Symbol
|
Number of Protons
|
Number of Neutrons
|
Number of Electrons
|
|
C
|
6
|
6
|
6
|
|
C
|
6
|
7
|
6
|
|
Ca
|
20
|
21
|
20
|
|
Pt
|
76
|
117
|
78
|
|
U
|
92
|
146
|
92
|
a. berylium: 4 protons, 4 neutrons, 4 electrons.
b. nitrogen: 7 protons, 7 neutrons, 7 electrons.
c. neon: 10 protons, 10 neutrons, 10 electrons.
21. A lead atom must have lost two electrons.
22. a. Carbon: 12, Calcium: 41, Platinum: 195, Uranium: 238 b. Carbon has two isotopes
23. No this is not sufficient because atomic numbers deal with a total rather than specifics on an element.
24. Electrons are much lighter than protons and neutrons.
25.
Mg-24
|
24
|
12
|
12
|
Mg-25
|
25
|
12
|
13
|
Mg-26
|
26
|
12
|
14
|
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