HelpContactFor teachers and institutes
>_StemPy Lab
Mock TestsClassesGroups

>_StemPy Lab

Learn. Solve. Code the solutions. Test yourself.

Live examsFree mock exams, timed and rankedEveryone starts together, and your score and rank come the moment it ends.See the exams →

Learn

  • Physics
  • Chemistry
  • Mathematics
  • Biology
  • Python Programming
  • Statistics & Data Science
  • Classes
  • Groups

Practice

  • Problems
  • Quizzes
  • Mock Tests
  • Question Sets
  • Exams
  • Certificates
  • Python Labs
  • AI Practice Generator
  • Student-Created Tests

Community

  • Discussions
  • Resources
  • Notes
  • Blog

Account

  • Dashboard
  • My Content
  • Profile
  • Log in
© 2026 senLearn. All rights reserved.HelpAboutContactPrivacy PolicyTerms of UseRefund Policy
  1. Problems
  2. /The Periodic Table
  3. /Groups and Families

Groups and Families

Chemistry
+ Upload a Problem
More in The Periodic TableDevelopment of the Periodic TablePeriodic TrendsGroups and Families
17 problems
Type:
1.
On the Pauling scale sodium is 0.9, hydrogen 2.1, carbon 2.5 and chlorine 3.0. New
High School (11–12) · Periodic Trends, Groups and FamiliesStemPy LabStemPy Lab
Hard
2.
Sodium oxide, aluminium oxide and sulphur trioxide are each tested with water, with dilute acid and… New
High School (11–12) · Periodic Trends, Groups and FamiliesStemPy LabStemPy Lab
Medium
3.
Use the valences of the groups to write three formulas. New
High School (11–12) · Periodic Trends, Groups and FamiliesStemPy LabStemPy Lab
Easy
4.
An element of period 4 has the outer configuration 3d⁵ 4s². New
High School (11–12) · Development of the Periodic Table, Groups and FamiliesStemPy LabStemPy Lab
Medium
5.
A lanthanoid has the configuration [Xe] 4f⁷ 6s². New
High School (11–12) · Development of the Periodic Table, Groups and FamiliesStemPy LabStemPy Lab
Hard
6.
An element sits in period 5 and group 14. Write its outer configuration and find its atomic number. New
High School (11–12) · Development of the Periodic Table, Groups and FamiliesStemPy LabStemPy Lab
Medium
7.
Arsenic has Z = 33. Write its configuration with a noble gas core, and find its period, group and… New
High School (11–12) · Development of the Periodic Table, Groups and FamiliesStemPy LabStemPy Lab
Easy
8.
Hydrogen is placed at the top of group 1, but it is hard to place.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Medium
9.
An element has the electron arrangement 2, 8, 18, 7.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Medium
10.
The melting points of lithium and potassium are 454 K and 337 K.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Medium
11.
Francium is the alkali metal below caesium in group 1.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Medium
12.
Why are the noble gases found as single atoms, and not as molecules?
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Easy
13.
Will a reaction take place? If it does, write the products.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Medium
14.
Chlorine displaces bromine from potassium bromide: Cl₂ + 2 KBr → 2 KCl + Br₂.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Hard
15.
Barium reacts quickly with cold water, while magnesium hardly reacts with it.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Medium
16.
Sodium is stored under kerosene, but white phosphorus is stored under water.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Easy
17.
Lithium reacts with water: 2 Li + 2 H₂O → 2 LiOH + H₂.
High School (9–10), General · Groups and FamiliesStemPy LabStemPy Lab
Medium