Question

what does the box on top of the hydrogen mean?NO SPAMMING​

Answer 1

Answer:

means that if you look at the periodic table, then each element is in a box and the uppermost number in the box is usually the atomic number, which is the number of protons. (In the table in the video, the top number in the hydrogen box is 1, for helium it is 2, lithium 3, etc.)

Explanation:

Answer 2

Answer:

come in I will teach you

Explanation:

ok then join