MCQ's About "Atoms".

 ATOMS

Question 1

The BEST description of an element is a substance in which:

(A)  all the atoms are the same  (B)  all the atoms have the same atomic number

(C)  all the molecules are the same  (D)  the atoms cannot be split up by any means

Question 2

Which element has the symbol C?

(A)  chlorine  (B)  calcium  (C)  chromium  (D)  carbon

Question 3

Sulphur is an example of:

(A)  an element  (B)  a compound  (C)  a metal  (D)  a mixture 

Question 4

Copper chloride is an example of:

(A)  an element  (B)  A compound  (C)  a metal  (D)  a mixture

Question 5

Roughly how many chemical elements are there? Just over:

(A)  25  (B)  50  (C)  100  (D)  1000

Question 6

The four substances below are all solids. Which of them is made up of more than one kind of atom?

(A)  iron  (B)  tin  (C)  ice  (D)  carbon

Question 7

Which one of the following substances does NOT contain atoms of oxygen?

(A)  H2SO4  (B)  NaCl  (C)  MgO  (D)  HNO3

Question 8

Which element is present in all three of these substances?

H2SO4, Na2SO4, FeS

(A)  iron  (B)  oxygen  (C)  sulphur  (D)  hydrogen

Question 9

Which particles are found in shells around the nucleus of an atom?

(A)  neutrons  (B)  protons and neutrons

(C)  protons  (D)  electrons

Question 10

Which particles may be found in the nucleus of an atom?

(A)  protons and neutrons  (B)  protons and electrons

(C)  electrons only  (D)  neutrons only

Question 11

A new substance is found to be made of only one type of atom. How could this substance be best described?

(A)  an element  (B)  a mixture  (C)  a compound  (D)  a metal

Question 12

The number of protons in the nucleus of an atom is referred to as its:

(A)  mass number  (B)  atomic number  (C)  atomic weight  (D)  density

Question 13

Isotopes are forms of the same element which have different:

(A)  atomic numbers  (B)  electronic structures

(C)  numbers of electrons  (D)  numbers of neutrons

Question 14

The valency of an element is:

(A)  its combining power  (B)  the number of electrons in its atoms

(C)  the number of neutrons in its atoms  (D)  the number of protons in its atoms

Question 15

Valencies are always:

(A)  fractions  (B)  large whole numbers

(C)  small whole numbers  (D)  large and small numbers

Question 16

Imagine three different elements called A, B, and C. How many combinations of two atoms can we make with 

them?

(A)  2  (B)  3  (C)  6  (D)  9

Question 17

Referring back to the previous question, how many of the combinations of two atoms are still elements?

(A)  2  (B)  3  (C)  6  (D)  9

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Answers:

Question 1 (B)  Question 2 (D)  Question 3 (A)  Question 4 (B)  Question 5 (C)

Question 6 (C)  Question 7 (B)  Question 8 (C)  Question 9 (D)  Question 10 (A)

Question 11 (A)  Question 12 (B)  Question 13 (D)  Question 14 (A)  Question 15 (C)

Question 16 (C)  Question 17 (B)