Sodium has the atomic number 11
how many electrons are in a sodium ion, which has the symbol na+?
a)10
b)11
c)12

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Which entry is in the wrong position in the table?