alleryElements placed in the same group of the modern periodic table have the same number of:
ANeutrons
BElectron shells
CValence electrons
DProtons
Answer & Solution
Correct answer: C. Valence electrons
1. The group is decided by the outermost-shell configuration.
2. All group-1 (alkali metal) atoms have 1 valence electron; group-17 (halogens) have 7.
3. So members of one group share the same number of valence electrons.
4. Rule out B: down a group the number of shells increases, so it differs.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.31_
Keep practising Unit 1C1: Periodic Trends in Atomic Properties
Browse all Unit 1C1: Periodic Trends in Atomic Properties questions for Maharashtra SSC (Class 10), or explore more Chemistry topics.
Related questions
In which block of the modern periodic table are the nonmetals found?An element has the electronic configuration 2, 8, 2. To which group and period of the modeIn the halogen family (group 17), which member exists as a solid at room temperature?The tendency of a nonmetal atom to accept electrons and form an anion, which increases acrHow does the metallic character of elements change while moving down a group?The tendency of a metal atom to lose its valence electrons and form a cation is called itsAmong the period-2 elements Li, Be, B, C, N, O whose atomic radii are 152, 111, 88, 77, 74What happens to atomic size as one moves down a group of the modern periodic table?