Question

The elements E [ At. No. 17 ] Have an atomic mass of 35

write the number of protons, number of electrons, and electronic configuration of the element and hence, state whether the element is a 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 inert gas.

• they are odourless, colourless, 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 a noble gas.
• electronic configuration of the given element E is — 2,8,7.
• If there is 1,2,3 electron in their outermost shell then generally it is metal except, H, He, B.
• 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 centre of an atom I:e nucleus.
• Number of proton = atomic number of the atoms.
• Number of proton of the element E is = 17.

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

• electrons are revolving around the nucleus in the orbital.
• Number of electrons =number of protons or the atomic number of atoms.
• Number of electrons of element E is = 17.

Thus, the number of protons of element A is 17, the number of electrons of A element is 17, and the electronic configuration of element A is 2,8,7 and this is a not noble gas.