Idon't understand any of this:
calculate the percent ionic, the percent covalent, and the bond length (in picometers) of a chemical bond between phosphorus and selenium.
phosphorus—atomic radius: 109 pm; covalent radius: 106 pm; ionic radius: 212 pm.
selenium—atomic radius: 122 pm; covalent radius: 116 pm; ionic radius: 198 pm.
a. 2 percent ionic, 98 percent covalent, 222 pm
b. 98 percent ionic, 2 percent covalent, 410 pm
c. percent ionic, 96 percent covalent, 222 pm
d. 96 percent ionic, 4 percent covalent, 410 pm

In all living cells dna controls cellular activities by

Which statement is true about ionic compounds?

Gusing the milligrams of ascorbic acid you entered above, the ratio of total sample volume to aliquot volume, and the total milligrams of the vitamin c tablet that you dissolved, calculate the mass of ascorbic acid in the vitamin c tablet for each trial. do this by scaling up to find the amount (mg) of ascorbic acid in your 250 ml flask. enter your calculated mass of ascorbic acid in the vitamin c tablet, for each trial. be sure to enter your calculated mass in the corresponding order that you entered your milligrams of ascorbic acid. the milligrams of ascorbic acid you entered for entry #1 previously should correspond to the mass of ascorbic acid that you enter for entry #1 here.