____________ with atomic number $9$ has electronic configuration is $2,7$.

Q. An atom has electronic configuration of $2,8,18,7.$ What is the atomic number of atom?

Q. Atomic number of sodium is 11, it has following electronic configuration:

Q. Element with atomic number $113$ has been reported in August 2003. Its electronic configuration is similar to that of:

Q. An element with atomic number 106 has been discovered recently. Which of the following electronic configuration will it posses:

Q. Element $A$ has electronic configuration 2,7. $B$ has configuration 2,8,6. $C$ has configuration 2,8 while $D$ has 2,8,7. Which element will show similar chemical properties?