How many subshells are there in the n = 4 principal shell? how many subshells are there in the n = 4 principal shell? 1 2 3 4 not enough information?

Can someone me with 1 to 4 plz. fast

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

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?