Question 12 The diagram shows what happens when a blue soluble crystal is placed in a beaker of
water.
Water
After several hours
Blue
solution
Blue
crystal
Which row correctly describes the processes taking place?
Chemical process
Dissolving
Diffusion
A
✓
B
Х
Х
с
✓
Х
D
X Х
(1 mark]

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the answer is the first option

explanation:

just googled it m8. not that hard

lol

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.