Use your periodic table of elements. take any element of your choosing (from period 4 or above) and answer the following questions: what is the element's name and symbol? is it a metal, nonmetal, or metalloid? which family does it belong to? how many protons, neutrons, and electrons does its neutral atom have?

Solution: We are taking second element from the 4th period.

Element's name is Calcium.

It's symbol is Ca.

It is a metal because it looses its valence electron to form positive ions.

Calcium element lies in the second group of 4th period. The elements belonging to the second group are known as alkaline earth metals.

Atomic Number of Calcium = 20

Atomic number = Number of protons = Number of electrons

therefore,

Number of electrons and protons = 20

Atomic Mass of Calcium = 40

Atomic Mass = Number of neutrons + Number of proton

bu substituting the values of atomic mass and number of prtons, neutrons can be calculated

Number of neutrons = 20.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.