Subshell configuration

Which of the following is not a subshell?

How many electrons can fit in the s subshell?

How many electrons can fit in the f subshell?

How many electrons can fit in the p subshell?

Which of the following subshells is NOT present in the 3rd main shell?

Which subshell is the lowest in energy?

For the following electron configuration, which is the next subshell to be filled?

1s²2s²2p⁶3s²3p⁶

Write the electron configuration for a calcium atom. Don't put spaces in your answer

(a)  

Write the electron configuration for a calcium ion. Don't put spaces in your answer

(a)  

Here is the electron configuration for a chromium atom: 1s2 2s2 2p6 3s2 3p6 4s2 3d4

Write the electron configuration for a chromium ion. (no spaces)

(a)