Photo AI

An atom of calcium-48 can form a 2+ ion - CIE - A-Level Chemistry - Question 31 - 2019 - Paper 1

Question icon

Question 31

An-atom-of-calcium-48-can-form-a-2+-ion-CIE-A-Level Chemistry-Question 31-2019-Paper 1.png

An atom of calcium-48 can form a 2+ ion. Which statements about this ion are correct? 1. It has 20 protons. 2. It has 28 neutrons. 3. It has 22 electrons.

Worked Solution & Example Answer:An atom of calcium-48 can form a 2+ ion - CIE - A-Level Chemistry - Question 31 - 2019 - Paper 1

Step 1

1. It has 20 protons.

96%

114 rated

Answer

This statement is correct. Calcium has an atomic number of 20, which means it has 20 protons.

Step 2

2. It has 28 neutrons.

99%

104 rated

Answer

This statement is correct. The mass number of calcium-48 indicates that the total number of protons and neutrons is 48. Since calcium has 20 protons, it has 48 - 20 = 28 neutrons.

Step 3

3. It has 22 electrons.

96%

101 rated

Answer

This statement is incorrect. A calcium ion with a 2+ charge indicates that it has lost 2 electrons. Therefore, it will have 20 protons and 18 electrons (20 - 2 = 18).

Join the A-Level students using SimpleStudy...

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

Other A-Level Chemistry topics to explore

Atomic Structure

Chemistry - AQA

Formulae, Equations & Calculations

Chemistry - AQA

The Mole, Avogadro & The Ideal Gas Equation

Chemistry - AQA

Types of Bonding & Properties

Chemistry - AQA

Molecules: Shapes & Forces

Chemistry - AQA

Energetics

Chemistry - AQA

Kinetics

Chemistry - AQA

Chemical Equilibria, Le Chateliers Principle & Kc

Chemistry - AQA

Oxidation, Reduction & Redox Equations

Chemistry - AQA

Periodicity

Chemistry - AQA

Group 2, the Alkaline Earth Metals

Chemistry - AQA

Group 7 (17), the Halogens

Chemistry - AQA

Introduction to Organic Chemistry

Chemistry - AQA

Alkanes

Chemistry - AQA

Halogenoalkanes

Chemistry - AQA

Alkenes

Chemistry - AQA

Alcohols

Chemistry - AQA

Organic Analysis

Chemistry - AQA

Organic & Inorganic Chemistry Practicals

Chemistry - AQA

Thermodynamics

Chemistry - AQA

Rate Equations

Chemistry - AQA

Equilibrium constant (Kp) for Homogeneous Systems

Chemistry - AQA

Electrode Potentials & Electrochemical Cells

Chemistry - AQA

Fundamentals of Acids & Bases

Chemistry - AQA

Further Acids & Bases Calculations

Chemistry - AQA

Properties of Period 3 Elements & their Oxides

Chemistry - AQA

Transition Metals

Chemistry - AQA

Reactions of Ions in Aqueous Solution

Chemistry - AQA

Optical Isomerism

Chemistry - AQA

Aldehydes & Ketones

Chemistry - AQA

Carboxylic Acids & Derivatives

Chemistry - AQA

Aromatic Chemistry

Chemistry - AQA

Amines

Chemistry - AQA

Polymers

Chemistry - AQA

Amino acids, Proteins & DNA

Chemistry - AQA

Organic Synthesis

Chemistry - AQA

Organic Mechanisms

Chemistry - AQA

Nuclear Magnetic Resonance Spectroscopy

Chemistry - AQA

Chromatography

Chemistry - AQA

Physical Chemistry Practicals

Chemistry - AQA

Organic Chemistry Practicals

Chemistry - AQA

;