Understanding Calcium Ions and Electrons

Understanding Calcium Ions and Electrons

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Mia Campbell

FREE Resource

This video tutorial explains how to determine the number of protons and electrons in a calcium ion (Ca2+). It begins by discussing neutral calcium, which has an atomic number of 20, indicating 20 protons and 20 electrons. The video then explains that in ions like Ca2+, the number of protons remains the same, but the number of electrons changes. For Ca2+, two electrons are lost, resulting in 18 electrons. The tutorial emphasizes the concept of ion charges, where losing electrons results in a positive charge, and gaining electrons results in a negative charge.

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9 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main focus of this video tutorial?

Understanding the periodic table

Finding the number of neutrons in Ca2+ ions

Learning about chemical reactions

Calculating the number of protons and electrons in Ca2+ ions

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the atomic number of an element represent?

The atomic mass

The number of protons

The number of electrons

The number of neutrons

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many protons does neutral calcium have?

18

24

20

22

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the key difference between neutral calcium and Ca2+ ions?

The number of protons

The number of electrons

The number of neutrons

The atomic mass

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many electrons does a Ca2+ ion have?

22

20

18

16

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to an atom when it loses an electron?

It gains a proton

It becomes a positive ion

It becomes a negative ion

It remains neutral

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does a Ca2+ ion have fewer electrons than neutral calcium?

It loses electrons

It gains electrons

It gains protons

It loses protons

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What charge does an atom have after losing two electrons?

1+

Neutral

2-

2+

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result when an atom gains an electron?

It becomes a negative ion

It becomes neutral

It loses a proton

It becomes a positive ion