# 1ปรนัยWhat is the order of elements in the periodic table based on?The number of protons in the nucleusThe electric charge of the nucleusThe number of neutrons in the nucleusAtomic mass
# 3ปรนัยWhat is the main reason that Group 17 elements, the halogens, are highly reactive?They have very small atomic masses.They readily lose electrons.They gain an electron to form a negative ion.They are already stable.
# 4ปรนัยWhich side of the periodic table are nonmetals like carbon found?Left-most sideRight sideMiddle columnBottom rows