Homework

13. a) row- periods
      b) column- group/ family

14. Alkali metal family:  K (Potassium) & Na (Sodium)

15. a. Found in column 18.
      b. They are inert gasses
      c. They are unreactive (chemically inert)

16. a)  MgF
      b) GaP

17. P- 68⁰C

18. I thought it would be lower because it weighs less than iodine and it has a stronger attraction.

19.
C- 6 protons, 6 neutrons, 6 electrons
N- 7 protons, 7 neutrons, 7 electrons
Ca- 20 protons, 20 neutrons, 20 electrons
Pt- 78 protons, 117 neutrons, 78 electrons
U- 92 electrons, 146 neutrons, 92 electrons

20. a) Be- 4 protons, 5 neutrons, 4 electrons
      b) N-  7 protons, 7 neutrons, 7 electrons
      c) Ne- 10 protons, 10 neutrons, 10 electrons

21. The atom must have lost two electrons to give it a charge of 2+.

22. a) Carbon 12.01
          Nitrogen 14.01
          Calcium 40.08
          Platinum 195. 08
          Uranium 238.03

b)The element Carbon has two isotopes because it has the same number of protons, but has the ablility to posses different quantities of neutrons.

23. It is not- we do not know the number of protons, electrons, neutrons, or which characteristics it shares with other elements on the table.

24. An electron has the least mass of the three because it has a negative charge, so it weighs a negative charge or a charge so small that scientist do not detect it.

25. a) 12
      b) 12
      c) 12
      d) 13
      e) 12
      f)14