What element is represented by 1s22s22p63s23p64s5

                  Calcium

                          The position of an element in representative blocks of periodic table can be located by finding out its valence shell and the number of valence electrons present in that particular valence shell.

The electronic configuration given is as follow,

                                    1s², 2s², 2p⁶, 3s², 3p⁶, 4s²

Remember than the s orbital can accomodate the maximum of 2 electrons hence, the 5 can be ignored.

As the valence shell is 4 it means that the element is present in period 4 and the number of electrons in shell 4 are two hence, the group number is 2.

On inspecting group 2 and period 4 we found that the element is Calcium.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation: