Similar Chemical Properties:

Elements with similar chemical properties are those that belong to the same group in the periodic table. This is because elements in the same group have the same number of valence electrons, which determines their chemical behavior. In this case, the element in question has an atomic number of 15, which means it belongs to group 15 of the periodic table.

Explanation of Each Option:

a) Be (4): Beryllium (Be) is in group 2 of the periodic table. It has 2 valence electrons. Therefore, it does not have the same number of valence electrons as the element in question (which has 5 valence electrons in group 15). Therefore, Be is not the correct answer.

b) Ne (10): Neon (Ne) is in group 18 of the periodic table. It is a noble gas and has a completely filled valence shell with 8 electrons. Therefore, Ne does not have the same number of valence electrons as the element in question. Therefore, Ne is not the correct answer.

c) N (7): Nitrogen (N) is in group 15 of the periodic table, just like the element in question. It has 5 valence electrons. Therefore, N has the same number of valence electrons as the element in question. Therefore, N is the correct answer.

d) O (8): Oxygen (O) is in group 16 of the periodic table. It has 6 valence electrons. Therefore, it does not have the same number of valence electrons as the element in question. Therefore, O is not the correct answer.

Conclusion:

The element with an atomic number of 15 will show similar chemical properties to Nitrogen (N), which is in group 15 of the periodic table and has 5 valence electrons.

The valence electrons of the atomc number 15 has 5 electrons in it's outermost shell. Nitrogen also has 5 electrons in it's outermost shell . It also belongs to 15th group and has same chemical properties. others have 2,8 and 6 in their outermost shell