The correct answer is (a) An atom has an equal number of electrons and protons. Atoms are electrically neutral, meaning the number of protons (positively charged) always equals the number of electrons (negatively charged). However, the number of neutrons may ...
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The correct answer is (c) The two oxygen atoms are isotopes. Isotopes of an element have the same number of electrons and protons but different numbers of neutrons. In ethyl ethanoate (CH₃COOC₂H₅), both oxygen atoms belong to the same element ...
Non-metals like fluorine (F), chlorine (Cl), and bromine (Br), which gain one electron to form negative ions (anions). Thus, elements with valency 1 are not always metals or non-metals but can be either. Class 9th Science NCERT MCQ Questions NCERT ...
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 ...
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, ...