Which of the following elements is the most reactive? a
Beryllium

b
Calcium

c
Magnesium

d
Barium

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?