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In Mendeleev’s Periodic Table, Why Was There No Mention Of Noble Gases Like Helium, Neon And Argon?

In Mendeleev’s periodic table, noble gases like helium, neon and argon were not mentioned because of the following reasons: Noble... View Article

Mendeleev left some gaps in his periodic table so that the elements with similar properties fell in the same vertical... View Article

The two criteria used by Mendeleev to classify the elements in his periodic table are: Increasing atomic mass Grouping of... View Article

The elements are classified into different groups and periods based on their properties. The classification of elements helps us to... View Article

Reversible Change –-A change that can be reversed is called a reversible change. The freezing of ice and the melting... View Article

The SI unit of the universal gas constant is JK −1mol−1 Explore more such questions and answers at BYJU’S.

The electron-dot structure is the diagrammatic representation of elements that show the bonding between atoms of a molecule, the lone... View Article

Halogens are strong oxidising agents because they have a high tendency to accept electrons. The halogens are a Group 17... View Article

The electrons left in the valence shell are 2. Xe (Xenon) has eight valence electrons and it shares six electrons... View Article

Pentane- C5H12 has three structural isomers. Explore more such questions and answers at BYJU’S.

One atmospheric pressure (atm) is equal to 101325 pascals, or newtons of force per square metre, equivalent to 760 mmHg... View Article

Chlorine has an atomic number of 17.Therefore, the electron configuration of chlorine is 1s2 2s2 2p6 3s2 3p5 Explore more... View Article

If CO2 is passed through lime water for a short duration, it turns lime water milky. It is due to... View Article

The valency of magnesium with atomic number 12 is 2. We know that the electronic configuration of magnesium is 2,... View Article

The stability of a lyophobic colloidal solution is due to the charge on the particles.

The hyperconjugation involves the overlap of the σ−p orbital. It is also called σ−π conjugation or no-bond resonance.

The symbol of cobalt is Co. Cobalt is a chemical compound and its atomic number is 27.

The difference between the acids and bases are: Acids are sour in taste and bases are bitter in taste Acids... View Article

An example of Urochordata is herdmania. Urochordata also known as Tunicates, is a marine invertebrate animal, a member of the... View Article

The difference between sepaloid and petaloid is: If a perianth is green, then it is known as sepaloid. If a... View Article