Question

The elements D [ At. No. 18 ] Have an atomic mass 40

write the number of protons, number of electrons, and electronic configuration of the element and hence, state whether the element is noble gas and why

Answer 1

Noble gas or inert gas — All those elements that have full fill the outermost shell with an electron fall in the category of noble (inert) gas

• They are odorless, colorless, tasteless, and gases

Electronic configuration — The distribution of electrons in the given shell or orbitals is known as electronic configuration

• It also helps to predict whether the elements are metal,non-metal, metalloid, and noble gas
• The electronic configuration of the given element D is — 2,8,8
• If there is 1,2,3 electron in their outermost shell then generally it is metal except, H (Hydrogen), He (Helium), B (Boron)
• If there is 4,5,6,7 electron in their outermost shell then generally it is non-metal
• If there is 2[He], 8 electron in their outermost shell then generally it is a noble gas

Proton — It is positive sub-particles of the element

• Present at the center of an atom I:e nucleus
• Number of proton = atomic number of the atoms
• The number of proton of the element D is = 18

Electron — It is a negative sub-particles of the element

• Electrons are revolving around the nucleus in orbital
• Number of electrons in a neutral atom = atomic number of the atoms
• Number of electrons of element D is = 18

Thus, the number of proton of element D is 18, the number of electrons of element D is 18, and the electronic configuration of the element D is 2,8,8, and this is a noble gas because it has completely filled (8 electrons) valence shell