Question

In the symbol 4/2 He, the superscript 4 is the _____ for helium, and the subscript 2 is the ______ for helium.

Answer 1

atomic mass
atomic number

Answer 2

thank you! can u help me with another?

Answer 3

What naturally occurring radioisotope is used as the fuel for a nuclear reactor?

Answer 4

It's uranium

Answer 5

Thank's so much

Answer 6

Hold on a minute - 4 in the symbol for helium is the mass number and 2 is the atomic number. If you want extra credit, you could put that 4 is also the baryon number: see this page: http://en.wikipedia.org/wiki/Mass_number

Answer 7

ok thank you

Answer 8

One more thing while I'm being pedantic - there's no need for an apostrophe in "Thanks". An apostrophe is used to denote that something belongs to someone or a missing letter: "Steven's pen" and "doesn't" are examples.

Answer 9

can u help meOn the periodic table, there are two numbers in the block for the element potassium, K: 19 and 39.098. What are these two numbers, and what do they represent? with this one?

Answer 10

See my previous answer

Answer 11

ok THANKS!!!!!