How do atomic numbers work?

Answer 1

The atomic number, #Z#, is the number of protons, massive, positively charged nuclear particles that define the identity of the element.

If #Z# #=# #1#, the element is hydrogen; if #Z# #=# #2#, the element is helium; if #Z# #=# #3#, the element is lithium; .....................if #Z# #=# #31#, the element is gallium.

#Z# gives also the number of electrons in the neutral element. You do not have to remember these. In every exam you ever sit in Chemistry or Physics, you should be supplied with a Periodic Table of Elements.

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Answer 2

Wyatt Atkins

The number of protons in an atom's nucleus is represented by its atomic number, which is what makes each element unique on the periodic table. It also determines the chemical properties of each element. The number of electrons in an element's neutral atom is indirectly indicated by its atomic number, which is equal to the number of protons in the nucleus, which is balanced by the number of electrons orbiting the nucleus.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.