Question 1

What determines the atomic number of an element?

Accepted Answer

The atomic number is determined by the number of protons in the nucleus of an atom. It uniquely identifies each element on the periodic table.

Question 2

What is the difference between an atom's atomic mass and its atomic number?

Accepted Answer

The atomic number is the count of protons only, while the atomic mass is the total count of protons plus neutrons in the nucleus.

Question 3

What are isotopes?

Accepted Answer

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons, giving them different atomic masses.

Question 4

As you move from left to right across a period on the periodic table, what happens to electronegativity?

Accepted Answer

Electronegativity generally increases from left to right across a period because the nuclear charge increases while the atomic radius decreases, pulling electrons more strongly.

Question 5

What characteristic do all elements in the same group (column) of the periodic table share?

Accepted Answer

Elements in the same group share the same number of valence electrons, which gives them similar chemical properties and reactivity.

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