Among the following the odd pair is

The term nucleons refer to

The correct electronic configuration of potassium is

Law of multiple proportions was proposed by _________

An alpha particle is identical with a ___________Nucleus.

Calcium and Argon are examples of a pair of __________

_________ isotope is used in the nuclear reactors.

The valency of Argon is ________

The law of reciprocal proportions was proposed by

Matter consists of very small and indivisible particles called________

__________has no neutron.

In an atom, electrons revolve around the nucleus in fixed orbits

Smaller the size of the orbit, lower is the energy of the orbit

The maximum number of electron in L Shell is 10

Atoms of an element combine in small whole numbers to form molecules.

Orbit is the path by which electrons revolve around the nucleus. 

Name an element which has the same number of electrons in its first and second shell

Compare the charge and mass of protons and electrons.

Ca²⁺ has completely filled outer shell. Justify your answer

Arrange the following in the increasing order of atomic number
Calcium, Silicon, Boron, Magnesium, Oxygen, Helium, Neon, Sulphur, Fluorine and Sodium

Copy the following and write the names of the laws and their simple definitions in the space provided.

Methane burns in oxygen to form carbon dioxide and water vapour as given by the equation
CH_4(g) + 2O_2(g) ➝ CO_2(g)+ 2H₂O_(g)
Calculate: (i) the volume of oxygen needed to burn completely 50 cm³ of methane and (ii) the volume of carbon dioxide formed in this case.

List the uses of isotopes?

Draw the structure of oxygen and sulphur atoms.

Hydrogen sulphide (H₂S) contains 94.11% sulphur, water (H₂O) contains 11.11% hydrogen and sulphur dioxide (SO₂) contains 50% of oxygen. Show that the results are in agreement with the law of reciprocal proportions

Explain the postulates of Bohr’s atomic model.