Q. Which of the following elements does not contain neutrons?
(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Copper
(E) None of the above/More than one of the above
(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Copper
(E) None of the above/More than one of the above
Answer. Hydrogen
Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol 1H), has one proton and no neutrons.
No comments