the nucleus of an atom contains 8 protons and 9 neutrons. how many electrons does the atom have

A 4
B 8
C 9
D 15

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Imagine that you own a property that is exactly 2.2 acres large. you want to sell your property, but your realtor tells you that you cannot sell your land by the acre. in order to sell your land you need to determine the area you own in units of square meters? given that there are 1.6 kilometers in 1 mile and 640 acres in 1 square mile, what is the area of land that you own in square meters square meters?

What is the percentage of hydrogen in nitrogen trihydride