Question

Radius and density change in mendeleev's table from left to right

Answer 1

answer :----

while going left to right within a period the outermost she'll remains the same.
the positive charge on the nucleus goes on increasing while the atomic radius goes on decreasing.....

Answer 2

As you travel the periodic table from left to right their are several aspects of the characteristics of the elements that change.

First, all of the elements to the left of the staircase created by B, SI Ge, As, Sb, Te (metalloids), are all metals. Those to the right are non-metals.

Next the atomic number and therefore the proton number increase as you move from left to right B - 5, C - 6, N -7.

Also the Atomic Mass increases from left to right B - 10.81, C - 12.01,
N - 14.01. There are some exceptions Sg & Bh, Th & Pa, U & Np and Pu & Am.

The Electronegativity also increases as you move from left to right on the periodic table.
Ionization Energy increases from left to right on the periodic table.

But

Atomic radius decreases moving left to right on the periodic table.