Atomic structure (Year ten)

The questions in your test are set out below. You do not lose marks for wrong answers. Once you have completed the test, click Submit.

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1. Which one of the following atoms contains the greatest number of neutrons.
A) Sodium with an atomic mass number of 23 and an atomic number of 11 B) Potassium with an atomic mass number of 39 and an atomic number of 19 C) Chlorine with an atomic mass number of 35 and an atomic number of 17 D) Carbon with an atomic mass number of 12 and an atomic number of 6 E) Argon with an atomic mass number of 40 and an atomic number of 18

2. 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.

3. The loss of electrons from a neutral atom
A) makes the atom negatively charged. B) reduces the mass number of the atom C) reduces the atomic number of the atom D) makes the atom positively charged E) significantly reduces the mass of the atom to almost a third of the original mass.

4. The loss of a neutron from a neutral atom:
A) increases the volume of the atom.; B) changes the charge on the atom ; C) reduces the atomic mass of the atom; D) reduces the atomic number of the atom; E) changes the chemical properties of the atom.

5. The neutral atom represented by the image on the right is most likely to:
A) form an ion with a charge of 2+ B) have an atomic mass of 8 atomic mass units C) take electrons from another atom D) have an atomic number of 5 E) be very stable and not react with any other atom.

6. Element "X" is pictured on the right. Which comment below is true?
A) An atom of element "X" has 15 electrons and 13 protons. B) An atom of element "X" has 22 protons and 23 neutrons. C) A neutral atom of element "X" has 23 electrons. D) An atom of element "X" has 45 electrons and 23 protons. E) An atom of element "X" has 22 electrons and 23 protons.

7. Look at the image of atoms “A”, “B”, “C” and “D” on the right(sub atomic particles are not drawn to scale). Which comment below is true?
A) Atoms “C” and “D” have the same atomic number B) Atoms “A” and “D” belong to the same element. C) Atoms “A” and ”B” have the same atomic number but different mass numbers. D) Atom “B” has an atomic mass number twice that of atom "C". E) Atoms “C” is almost twice as heavy as atom “A” .

8. A neutral atom with 16 protons is most likely to have
A) 16 neutrons B) 16 neutrons and 23 electrons C) an atomic mass number of 45 D) 16 electrons E) 20 neutrons and 20 electrons

9. The image on the right shows the nuclei of 4 different elements. Which one belongs to element "X"?
A) A B) B C) C D) D E) No nucleus belongs to element "X".

10. Which statement regarding nuclear energy is true?

A) A nuclear reaction is identical to a chemical reaction. B) Uranium is very unstable because it has too many electrons in its nucleus. C) A nuclear reaction occurs when electrons are fired into the nucleus of an atom making it very unstable. D) A nuclear reaction occurs when atoms share electrons between each other. E) A uranium atom becomes very unstable when neutrons are fired into its nucleus. It splits into two smaller nuclie giving out enormous amounts of energy in the process.