Question

atom of an element has 9 protons and electrons and 10 neutrons calculate the mass number of the element right is electronic configuration find the valency of the element right the atomic number of the element write the name of the element

Answer 1

mass no. = no. of neutrons +no. of protons
=9+10
=19
electronic configuration =2,7
valency=1
atomic no. =9
name of the element =fluorine

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