The correct answer is: (c) either metals or non-metals. Elements with valency 1 can be: Metals like sodium (Na), potassium (K), and lithium (Li), which lose one electron to form positive ions (cations). Class 9th Science NCERT MCQ Questions NCERT ...
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The atom with 3 protons is lithium (Li) because its atomic number is 3. The electronic configuration of lithium is 2,1, meaning it has one valence electron in its outermost shell. Valency is the number of electrons an atom loses, ...
The atomic number of aluminium is 13, meaning it has 13 electrons. The electrons are arranged in shells following the 2, 8, 3 distribution: 2 electrons in the first shell, 8 in the second, and 3 in the third. So, ...
The correct answer is:(c) nucleus in the atom Rutherford’s α-particle scattering experiment demonstrated that the positive charge and most of the mass of an atom are concentrated in a small central nucleus. This led to the discovery of the atomic ...
The correct answer is: (b) (ii) and (iv) Rutherford’s α-particle scattering experiment led to the following conclusions: (ii) The mass and positive charge of the atom are concentrated in a small central nucleus. (iv) Most of the space in an ...