The two names for horizontal rows on the periodic table are periods and series.
On the left side (the first 12 columns + the bottom four in the 13th column+the bottom two in the 14th column+the bottom one in the 15th column)
Two names for columns on the periodic table are groups and families. These columns group together elements with similar chemical properties due to their shared number of valence electrons.
The Periodic Table has 18 groups and 7 periods.
First column: Alkali metalsSecond column: Alkali Earth metalsSecond to last: HalogensLast: Noble Gases
The two names for horizontal rows on the periodic table are periods and series.
in column two
It has two, since it is in the second column on the periodic table.
On the left side (the first 12 columns + the bottom four in the 13th column+the bottom two in the 14th column+the bottom one in the 15th column)
Two names for columns on the periodic table are groups and families. These columns group together elements with similar chemical properties due to their shared number of valence electrons.
Some elements with two valence electrons include beryllium (Be) and magnesium (Mg) in group 2 of the periodic table. These elements have two electrons in their outermost energy level.
The Periodic Table has 18 groups and 7 periods.
There is no symbol KM in the periodic table.
Dmitri Mendeleev and Lothar Meyer
On the left side (the first 12 columns + the bottom four in the 13th column+the bottom two in the 14th column+the bottom one in the 15th column)Read more: Where_on_the_periodic_table_can_metals_be_found
First column: Alkali metalsSecond column: Alkali Earth metalsSecond to last: HalogensLast: Noble Gases
its in column two on the periodic table, so therefor it has two valence electrons .