What is the purpose of a rain gauge?

Explanation:

A rain gauge is a device which is used to collect and measure the amount of rainfall in a given time per unit area of a region. This device consists of container which is used to collect the rainfall. The amount of rainfall is measured in terms of height of the rainfall water captured in a container per  unit area in a particular time frame. The collected water is expressed in terms of millimeters. It is also called as udometer, ombrometer and pluviometer. The instrument is used by the meteorologists and hydrologists to obtain and measure the rainfall over a set period of time.  

bcde is the incorrect answer it is a

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