How can the number of core electrons be determined from the periodic table? A. By finding the atomic number minus the group number

B. By finding the atomic number minus the period number

C. By finding the atomic number plus the group number

D. By finding the group number plus the period number

A- by finding the atomic number minus the group number.

Explanation:

You can also find the core and valence electrons by determining or looking up the election configuration of the main group elements. The atomic number is the number of protons in the nuclei of the atoms of an element. A neutral atom has the same number of electrons as protons.

A. By finding the atomic number minus the group number

Explanation:

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.