How many electron shells does a Potassium element have?
How many electron shells does an Aluminum element have?
Select all the elements from the following list which are in group 3A of the periodic table?
Associate each of the following descriptions with its category of elements:
Usually reacts to acids and corrodes [blank_start]Metals[blank_end]
7 elements that are semi-conductors [blank_start]Metalloids[blank_end]
Category that is mostly formed of gases at room temperature and include Hydrogen [blank_start]Non-metals[blank_end]
Give the symbol of the element that has 2 electron orbits and has 6 electrons on its last shell. [blank_start]O[blank_end]
Give the symbol of the element that has 3 electron shells and 7 valence electrons. [blank_start]Cl[blank_end]