Valency is the number of electrons that an atom can gain or lose to attain the nearest noble gas configuration. Chlorine, sulphur and magnesium are all elements in the periodic table. The valency of an element can be determined by looking at its electronic configuration.
How will you find the valency of chlorine, sulphur and magnesium? Read More »
If the K and L shells of an atom are full, it means that the first and second electron shells are filled. According to the electronic configuration rules, the maximum number of electrons in the K shell (first shell) is 2, and the maximum number of electrons in the L shell (second shell) is 8. Therefore, the total number of electrons in the atom would be 2 (from the K shell) + 8 (from the L shell) = 10 electrons.
Carbon (Atomic number 6): Electron distribution – 2 electrons in the first shell (K shell) and 4 electrons in the second shell (L shell). Or 2, 4
Sodium (Atomic number 11): Electron distribution – 2 electrons in the first shell (K shell), 8 electrons in the second shell (L shell), and 1 electron in the third shell (M shell). Or 2, 8, 1
Write the distribution of electrons in carbon and sodium atoms. Read More »
To find the number of neutrons in a helium atom, you subtract the number of protons from the atomic mass.
Helium atomic mass = 4 u
Number of protons = 2
Number of neutrons = Atomic mass – Number of protons = 4 – 2 = 2
Therefore, helium atom has 2 neutrons.
Protons: Positively charged particles located in the nucleus. Neutrons: Neutral particles located in the nucleus. Electrons: Negatively charged particles that orbit the nucleus.
Name the three sub-atomic particles of an atom. Read More »
If an alpha-particle scattering experiment is carried out using a metal foil other than gold, there would be no change in observations if the foil is as thin as the gold foil used by Rutherford. This is because the basic structure of an atom remains the same regardless of the material. However, other metals are
Draw a sketch of Bohr’s model of an atom with three shells. K SHELL, L SHELL, M SHELL,
Draw a sketch of Bohr’s model of an atom with three shells. Read More »
He projected alpha particles (helium nuclei) at gold foil, and the positive alpha particles were deflected. This led Rutherford to conclude that protons exist in a nucleus and have a positive nuclear charge
In this model, the positive charge of the atom is spread out uniformly throughout the atom, while the negatively charged electrons are scattered within it. The atom is neutral as a whole because the positive charge of the atom balances the negative charge of the electrons.
An atom with one electron and one proton will not carry any charge and will be neutral. This is because an electron has a negative charge, while a proton has a positive charge, and the magnitude of each charge is equal. The two charges cancel each other out, resulting in a neutral atom. More Questions
If an atom contains one electron and one proton, will it carry any charge or not? Read More »
Canal rays, also known as positive rays, are positively charged ions that move towards the negative electrode (cathode) in a cathode ray tube. They were discovered by Eugen Goldstein in 1886. These rays are formed when the residual gas in the cathode ray tube is ionized by the high voltage applied across it. Canal rays helped scientists understand the existence of positively charged particles later identified as protons.
