Isotopes (year ten)

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1. Aluminium has the atomic number 13 while sodium has the atomic number 11.
Atom "X" has 18 neutrons 13 protons and 11 electrons. Which one comment below is true regarding atom "X"?
Atomic mass of Aluminium = 27, Sodium = 23.
 
A) Atom "X" is an isotope of aluminium.
B) Atom "X" is a sodium atom.
C) Atom "X" is an isotope of sodium.
D) Atom "X" is a sodium atom with two extra protons.
E) Atom "X" is an isotope of both sodium and aluminium.

2. Look at the image on the right. Which of the following are isotopes of the same element?
 
A) Atoms "D" and "C" are isotopes of the same element.
B) Atoms "A" and "B" are isotopes of the same element.
C) Atoms "A" and "C" are isotopes of the same element.
D) Atoms "C" and "B" are isotopes of the same element.
E) Atoms "D" and "B" are isotopes of the same element.

3. The nuclei of two atoms are shown on the right. Both atom A and B belong to the same element. Which comment below is true?
 
A) Atom A reacts differently during chemical reactions than atom B.
B) Atoms A and B have the same number of neutrons.
C) Atoms A and B have the same atomic mass.
D) Atoms A and B are isotopes.
E) Atoms A and B have different atomic numbers.

4. The symbols of four unknown elements are shown on the right. Which comment below is true?
 
A) A and C are isotopes of the same element.
B) D and B are isotopes of the same element.
C) B and C are isotopes of the same element.
D) A and B are isotopes of the same element.
E) A and D are isotopes of the same element.

5. The nuclei of four atoms are shown on the right. Atom A and B belong to the same element. Which comment below is true?
 
A) C and D are atoms of different elements.
B) C and A are atoms of the same element.
C) B and D have the same atomic number.
D) A and D are isotopes of the same element.
E) B and A have the same mass number.

6. The nuclei of two atoms are shown on the right. Both atom A and B belong to the same element. Which comment below is true?
 
A) The yellow spheres represent protons
B) The yellow spheres represent electrons
C) The red spheres represent neutrons
D) The red spheres represent electrons
E) The red spheres represent protons

7. The symbols of four unknown elements are shown on the right. Which comment below is true?
 
A) Y and Z are isotopes of the same element.
B) Y and W are isotopes of the same element.
C) Z and W are isotopes of the same element.
D) X and W are isotopes of the same element.
E) Y and X are isotopes of the same element.

8. The symbols of four unknown elements are shown on the right. Which comment below is true?
 
A) Y and Z have the same chemical properties.
B) Y and W are isotopes of the same element.
C) Z and W have the same chemical properties.
D) X and W are isotopes of the same element.
E) Y and X have the same chemical properties.

9. Atom "X" has 34 neutrons, 24 protons and 24 electrons.
Atom "Y" has 30 neutrons, 24 protons and 22 electrons.
Which comment below is true?
 
A) Atoms "X" and "Y" have the same mass number.
B) Atoms "X" and "Y" are atoms of two different elements.
C) Atoms "X" and "Y" are isotopes of the same element.
D) Atoms "X" and "Y" have different atomic numbers
E) Atoms "X" and "Y" both have a positive charge.

(c) Dynamic Science