1 Which element is classified as a noble gas at STP?

(1) hydrogen     (3) neon
(2) oxygen        (4) nitrogen

1         2         3         4        

1         2         3         4        

3 Metallic bonding occurs between atoms of

(1) sulfur       (3) fluorine
(2) copper     (4) carbon

1         2         3         4        

4 Atoms of the same element that have different numbers of neutrons are classified as

(1) charged atoms      (3) isomers
(2) charged nuclei      (4) isotopes

1         2         3         4        

5 Compared to the radius of a chlorine atom, the radius of a chloride ion is

(1) larger because chlorine loses an electron
(2) larger because chlorine gains an electron
(3) smaller because chlorine loses an electron
(4) smaller because chlorine gains an electron

1         2         3         4