Cadium
Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period.
The correct option is A.
Climate refers to the long time pattern of weather condition in a particular area. Climate is measured by assessing the patterns of variation in temperature, relative humidity, wind, atmospheric pressure, precipitation and other meteorological variables in a given area over a long period of time.<span />
The elements in a periodic table are arranged in the increasing order of their atomic number.
