+4 and +6 I think not sure tho
The elements in<span> groups 1a through 7a are called d. representative elements. The periodic table is organized according to increasing order of the atomic number of the elements. Groups have similar properties while the period of the elements determines the valence electrons in the outer shells.</span>
The harmonic law would suggest that Neptune will take a longer amount of time to orbit the sun than Mercury. That's what I think anyways
Answer:
all 4 of the middle ones are part of the nucleus
Isotopes are atoms of the same element that have different numbers of neutrons.
