Question

these carbon compounds.
dus series. Why? White
21. The atomic number of an element is 20. In which period of the modem periodic
table, could this element be placed? Why? How will you decide whether the
element is a metal or a non-metal?​

Answer 1

Answer:

an element with an atomic number of 20 would be Calcium (Ca) and it would be placed in the fourth period of the modern periodic table. This is because elements in the same period have the same number of electron shells, and Calcium has 4 electron shells.

To determine whether Calcium is a metal or non-metal, we can look at its position in the periodic table. Metals are located on the left side of the periodic table, while non-metals are located on the right side. Calcium is located on the left side of the periodic table, in group 2, so it is a metal. Additionally, metals tend to have a lustrous appearance, are good conductors of heat and electricity, and tend to be malleable and ductile, all of which are properties that Calcium exhibits.