Structure of the atom Worksheet-8
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Out of proton and neutron, which is heavier?
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Were neutrons known at the time Rutherford performed the scattering experiment?
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Why is proton so named?
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The cation is represented as M3+ What is the difference between the number of protons and electrons present?
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What is the name of element whose atom has K and L shell completely filled ? To which group it belongs?
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Do isobars have also identical chemical characteristics like isotopes ?
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The electronic configuration of an element is : 2(K), 8(L), 5(M). Predict its valency.
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What is the basic difference between the isotopes of an element?
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The element aluminium is written by the symbol 13AI27. Write the number of protons, electrons and neutrons present in it.
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What is the number of electrons in the valence shell of chlorine (Z = 17)?
Answer:
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Neutron is slightly heavier (1.675 × 10–27 kg) than proton (1.67 × 10–27 kg).
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No, neutrons were discovered later on by Chadwick in 1931 whereas scattering experiment was performed by Rutherford in 1911.
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Proton (H+) is formed when hydrogen atom
also called protium, loses an electron.
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In cation M3+, there are three protons more as compared to electrons. M3+ is formed when an atom of M loses 3 electrons.
M ® M3+ + 3e–
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The element is neon (Ne) Atomic number -10 electronic distribution: K(2), L(8)
It belongs to zero groups.
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Isotopes have same atomic number hence similar electronic configurations. Whereas Isobars have different atomic numbers. Their electronic configurations also differ. Hence they have different chemical properties.
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The valency of the element is 3. It is calculated as: 8 - 5 = 3. The element belongs to group 5.
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Isotopes of an element differ in the number of neutrons leading to different mass numbers.
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No. of protons = 13
No. of electrons = 13
No. of neutrons = 27 – 13 = 14.
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The electronic distribution of Cl is 2,8,7 Valence shell of chlorine has 7 electrons.
