tóng yī / zhōu qī / nèi / yuán sù / de / yuán zǐ / bàn jìng / tōng cháng / huì / zhú jiàn / jiǎn xiǎo

同一周期内，元素的原子半径通常会逐渐减小。

Within the same period, the atomic radius of elements usually decreases gradually.