On the periodic table there are columns that go up and down. elements that are in the same column

a) tend to have properties that are different
b) tend to have properties that are similar
c) tend to have similar atomic mass
d) tend to have different numbers of valence electrons

Write a brief passage describing a neutral atom of nitrogen-14 (n-14). describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. use the periodic table to you. 14 protons and eletrons since its a neutral atom

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

Can someone me with 1 to 4 plz. fast