Large sharks eat many other marine life animals. The sharks and the animals they eat are all part of which level of organization? (Select all that apply.) community
individual organisms
ecosystem
population

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8