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Questions

Explanations

1 Compared to the charge of a proton, the charge of all electron has

(1) a greater magnitude and the same sign

(2) a greater magnitude  and the opposite sign

(3) the same magnitude and the same sign

(4) the same magnitude and the opposite sign

2 Which atom has the largest atomic radius?

(1) potassium   (3) francium

(2) rubidium    (4) cesium

3 In the wave-mechanical model of the atom, an orbital is defined as

(1) a region of the most probable proton location

(2) a region of the most probable electron location

(3) a circular path traveled by a proton around the nucleus

(4) a circular path traveled by an electron around the nucleus

4 When an excited electron in an atom moves to the ground state, the electron

(1) absorbs energy as it moves to a higher energy state

(2) absorbs energy as it moves to a lower energy state

(3) emits energy as it moves to a higher energy :state

(4) emits energy as it moves to a lower energy state

5 Which polyatomic ion is found in the compound represented by the formula NaHCO₃?

(1) acetate                       (3) hydrogen sulfate

(2) hydrogen carbonate   (4) oxalate

HCO₃^- is hydrogen carbonate

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