Advertisements
Advertisements
प्रश्न
Write the names of the elements present in the:-
Sodium hydroxide
Advertisements
उत्तर
Sodium hydroxide : Sodium, oxygen, hydrogen.
APPEARS IN
संबंधित प्रश्न
If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Fill in the blank
An ion with negative charge is called _______
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
How did Neils Bohr visualise the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Write the full form of IUPAC.
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Define the following term:
Atom
Define the following term with an example.
Element
The smaller particles found in the atom is called ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
An element is composed of ______ atoms.
In the nucleus of `""_20"Ca"^40`, there are ______
What are the 3 most abundant atoms on the earth?
