SEP Construct an Explanation Look at Figure 2. In winter, ice forms on the lake surface. There is a layer of highly saline water below the ice. Suggest how

this layer has formed and why there are areas where the salty layer is

descending toward the bed of the lake in some places

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8