The periodic table can be read across from left to the ____ along the rows ____. It can also be read up and down the ____ columns. Rows of elements are called ____. They go across the whole periodic table from ____ to right, even if there is a gap. For example, the third period contains ____ (Na) to ____ (Ar) elements. ____ of elements are called ____ and are numbered. For example, group 4 contains ____ (C) elements through to flerovium (Fl).

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