Chemistry
Kj123
29

I don't know how to do this please help me

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(1) Answers
sl2319

Atomic number- Number of protons (Which is the number above the element) Q:What is the atomic number of Al? A:13 Mass number- Protons and neutrons of an atom (Unless specified, assume the atoms have the same number of electrons and protons)  Q:What is the mass number of Al? A:26.981538 or rounded to 27 For finding protons neutrons and electrons, look at your periodic table.   If you want to find the protons of lets say Hydrogen, You would look at the atomic number which is 1.  If you want to find the elections of Hydrogen, it would be the same as the atomic number, unless told otherwise. For finding neutrons, take the atomic number and subtract it from the mass number. So for Na on your paper, You would subtract 11 from 22.9 rounded up to 23, where it would equal 12 or 11.9  Now onto Electron configuration  Looking back at your periodic table, In electron configuration the periodic table is set up to show the location of electrons and atoms.  Each one of the rows on the table represents a ring of an atom. and each square represents an electron  S, P, D, F are what you use to represent the orbitals.  ^   ^   ^   ^ 2,  6, 10, 14 The S block is on the farthest left of the table which only includes 2 elements for every row. The P block is the big block on the farthest right which includes 6 elements for every row. The D block is the transition metals which is in the very middle of the table which includes 10 elements for every row.  The F block isn't used much, but it is the rare elements on the very bottom of the table that is all by itself. The F block has 14 elements for each row.  So for Phosphorus which is represented by P would be, 1s2, 2s2, 2p6, 3s2, 3p3 The big numbers to the left of the letter, represent the row that they are in The letters represent what block they are in And the coefficients to the right of the letter, represent how many electrons the block is using.  Hope this helps!!! :) if you have any questions, let me know! :) 

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