Atoms, elements and the periodic table

Question 1 of 10

Atoms of the same element with different numbers of neutrons are ___.

Question 2 of 10

Write the electron arrangement of: (a) oxygen (8) (b) magnesium (12) (c) argon (18).

Question 3 of 10

Explain why the noble gases are unreactive and give one use of a noble gas.

Question 4 of 10

The horizontal rows in the periodic table are called

Question 5 of 10

The mass number is the number of

Question 6 of 10

The electron arrangement of an atom with 6 electrons (carbon) is 2, ___.

Question 7 of 10

Atoms of the same element with different numbers of neutrons are

Question 8 of 10

Horizontal rows of the periodic table are called ___.

Question 9 of 10

The positively charged particle in an atom is the

Question 10 of 10

Neutrons have a negative charge.