An alpha particle consists of two protons and two
neutrons. what is the charge of an alpha particle?
(1) 1.25 × 10^19 c (3) 6.40 × 10^–19 c
(2) 2.00 c (4) 3.20 × 10^–19 c

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Explain the difference in reactivity of the elements based on their electron configurations.

Aswimmer is determined to cross a river that flows due south with a strong current. initially, the swimmer is on the west bank desiring to reach a camp directly across the river on the opposite bank. in which direction shoud the swimmer head? a. the swimmer should swim southeast. b. the swimmer should swim south. c. the swimmer shuold swim northeast. d. the swimmer should swim due north. e. the swimmer should swim due east.