Answer is: The sum of the masses of protons and neutrons is 20.1797.
This element (neon) has atomic number (Z) 10, which means it has 10 protons and 10 electrons.
Atomic number (Z) is the number of protons, which is characteristic of a chemical element.
Atomic mass (A) is 20.1797.
Ar is relative atomic mass (the ratio of the average mass of atoms of a chemical element to one unified atomic mass unit) of an element .
Answer:
Atoms consist of a nucleus made of protons and neutrons orbited by electrons.
Isotopes are atoms that have same number of protons but they differ in the number of neutrons and in atomic mass.
Explanation:
magnesium can be used for the construction as only when the metal is divided into fine pieces or as a thin sheet, magnesium will burn rapidy.
Radioactive material undergoes first order dissociation kinetics.
For 1st order system,
k = 0.693 / t1/2
where, t 1/2 = half-life of the radioactive disintegration process.
Given that, t 1/2 = <span>73.83 days
Therefore, k = 0.009386 day-1
Also, for 1st order reaction,
k = </span>

Given that, Co = initial concentration of <span>Iridium-192 = 100 g
Therefore, </span>0.009386 =

On rearranging we get,
Ct = 100
Answer: Ct = 100

equation approximates the amount of Iridium-192 present after t days