Ferns and pine trees can be classified as different organisms from each other based on whether they have flowers
vascular system
seeds.
a nonvascular system

hurryy answer need help

fe 55.85 g/mol and h2o 18.02 g/mol.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8