how many groups and periods are there in the morden periodic table? how do the atomic size and metallic character elements vary as we move: down a group and
from left to right in a period
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Features of Modern Periodic Table. There are eighteen vertical columns known as groups in the modern periodic table which are arranged from left to right and seven horizontal rows which are known as periods.
The atomic size of elements increases due to addition of new valence shells. Also, metallic property / character increases down the group. ... Due to an increase in nuclear charge it results in a decrease of size of an atom. Hence, the non-metallic character increases across a period.
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