A test that is very important in the start-up of aquaponics tanks, but is a reading that needs to go down after an extended amount of time. If it stays high it is a fright.

particle   p is an electron and particle q is a neutron

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.