In a chemical formula, the number of atoms for each element is usually indicated by a
postscript
subscript
superscript
symbol

Answer

subscript

Explanation

Atomic number of an element represent the protons in nuclear of an atom. It is written as a subscript in a chemical formula.

For example, the chemical formula of a uranium-235 is U₉₂²³⁵.  This means that uranium has an atomic number of 92 and a mass number of 235.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

uio

explanation: