Of the groups below, which are the least chemically reactive?
group 2a elements
group 7a elements
group 1a elements
group 3a elements

How are elements arranged in a periodic table

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?