✅ Correct Answer: Period
Source: This question is taken from the Everyday Science
✅ Correct Answer: Groups
✅ Correct Answer: Mercury and Bromine
✅ Correct Answer: Group
✅ Correct Answer: Alternating Current (AC)
✅ Correct Answer: Electronic Configuration
✅ Correct Answer: Increasing in atomic number
✅ Correct Answer: lithium
✅ Correct Answer: Periods
✅ Correct Answer: Long period
✅ Correct Answer: Horizontal rows