10, 3 Exam

Question 1

What determines the order of the elements in the periodic table?

Answer 1

They are ordered based on atomic numbers. Which is the number of protons in the nuclei.

Question 2

If metals are found on the left hand side of the periodic table, what types of elements are on the right hand side?

Answer 2

Nonmetals are on the right hand side as they have higher electronegativity. This includes noble gases and halogens.

Question 3

What is the common feature of the electron structure of elements in the last column of the periodic table?

Answer 3

They all have 8 valence electrons (a full outer shell). As a result they are stable and unreactive.

Question 4

What is the difference between a compound and element?

Answer 4

Elements are pure substances made up of only one type of atom whereas a compound is formed with two or more elements that are chemically bonded.

Question 5

What is the difference between an atom and an ion?

Answer 5

An atom is neutral, containing the same number of electrons and protons. But an ion an electrically charged particle produced by removing electrons from a neutral atom or adding electrons to a neutral atom.

Question 6

Why don’t the noble gases form ions?

Answer 6

Because they already have a full outer shell, so they are stable without having to give or gain electrons.

Question 7

Order of elements

Answer 7

Hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium.