Chemistry - January 2011

PART A

1 An orbital is a region of space where there is a high probability of finding

(1) a proton      (3) a neutron
(2) a positron   (4) an electron

2 Which statement matches a subatomic particle with its charge?

(1) A neutron has a negative charge.
(2) A proton has a negative charge.
(3) A neutron has no charge.
(4) A proton has no charge.

3 An atom of any element must contain

(1) an equal number of protons and neutrons
(2) an equal number of protons and electrons
(3) more electrons than neutrons
(4) more electrons than protons

4 Which statement compares the masses of two subatomic particles?

(1) The mass of an electron is greater than the mass of a proton.
(2) The mass of an electron is greater than the mass of a neutron.
(3) The mass of a proton is greater than the mass of an electron.
(4) The mass of a proton is greater than the mass of a neutron.

5 The bright-line spectrum of sodium is produced when energy is

(1) absorbed as electrons move from higher to lower electron shells
(2) absorbed as electrons move from lower to higher electron shells
(3) released as electrons move from higher to lower electron shells
(4) released as electrons move from lower to higher electron shells

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