An atom has an average atomic mass of about 24.3 amu. what is the chemical
symbol for the atom? consult the periodic table.
o mg
o cr
o mn
o ca

Option (a) is the correct answer.

Explanation:

Atomic number is the sum of only total number of protons present in an element. Whereas mass number is the sum of total number of both protons and neutrons present in an element.

So, for an atom with atomic mass 24.3 amu must have an atomic number as 12.

And, according to the periodic table only magnesium is the element which has an atomic number 12. As every element has different atomic number.

Chemical symbol which represents magnesium is Mg.

Thus, we can  conclude that Mg is the chemical  symbol for the atom which has an average atomic mass of about 24.3 amu.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.