Which of the following is correct pair of elements and its symbol?
As we know, in the periodic table;
The symbol S is used for sulphur
The symbol Ag is used for silver
The symbol Na is used for sodium
The symbol K is used for potassium
So, option ( d) is the correct✔ answer.
Valency of hydrogen is 1 and that of sulphur is 2. What should be the formula of hydrogen sulphide?
Hydrogen sulfide is the chemical compound with the chemical formula H2S. It is a colorless gas with the characteristic foul odor of rotten eggs. It is very poisonous, corrosive, and flammable.
One atomic mass unit is a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of ___________.
An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon 12. The mass of any isotope of any element is expressed in relation to the carbon 12 standard.
Which of the following is the correct IUPAC symbol for the element Cobalt?
Which one of the following is the modern symbol of Gold?
An atom has a mass number of 23 and atomic number 11. The number of protons are ________.
A neutral atom will have the samenumber of electrons is does protons. Since it has an atomic number of 11 it must have 11 protons. Since it has anatomic mass of 23 it must have 12 neutrons.
NaCl molecule is made of which of the following ions?
Valency of Calcium element is:
The valency of Calcium of 2+. Calcium has 2 electrons in its outermost shell, its electronic configuration being (2,8,8,2). In order to attain stability it loses 2 electrons to become stable according to the octet rule.
Chemical formula of a compound is A2B3. The valency of A is
What is the atomic mass of nitrogen?