WILL MARK BRAINLEST PLEASE HELP 10 PTS Contrast: Use the graphic organizer to describe and contrast three ways to measure pH. In the organizer, describe which methods are most and least accurate.

the answer is   c.) 1575 j.

explanation:

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