the periodic table

Question	Answer
Who made the modern periodic table?	Dmitri Mendeleev- he left gaps for the unknown elements
What determines an element's position on the periodic table?	The atomic number
What are the columns of the periodic table called?	groups they are numbered, and an element's group number is the same as the number of electrons in its outer shell
True or False all elements in a group have similar chemical properties	True.
How do they react? 1) metals 2) non-metals 3) noble gases	1) by losing electrons 2) by gaining electrons 3) very unreactive due to their stable electronic structures
What does an element's period (horizontal row) tell us?	An element's period number is the same as the number of occupied energy levels

Resource summary

	Created by Farha Idrees about 8 years ago