Question

An Ion Y2- contains 18 electrons and 16 neutrons. Find out its mass no., atomic number and

name the element.​

Answer 1

$\pink{Atomic \: Number}</p><p>$

The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. For example, in a sodium atom, there are 11 electrons and 11 protons. Thus the atomic number of Na atom = number of electrons = number of protons = 11.

$atomic \: number \: = no \: of \: protons \:$

$\green{atomic \: number = 16}$

$\pink{Mass \: Number}$

An element’s mass number (A) is the sum of the number of protons and the number of neutrons. The small contribution of mass from electrons is disregarded in calculating the mass number. This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu. Isotopes of the same element will have the same atomic number but different mass numbers.

$mass \: num = no \: of \: protons \: and \: electrons$

$\green{mass \: number \: = 16 + 18 = 34}$

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