Understanding Calcium Ions and Electrons

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.

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

What does the atomic number of an element represent?

• The atomic mass

• The number of protons

• The number of electrons

• The number of neutrons

How many protons does neutral calcium have?

• 18

• 24

• 20

• 22

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

How many electrons does a Ca2+ ion have?

• 22

• 20

• 18

• 16

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

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

• It loses electrons

• It gains electrons

• It gains protons

• It loses protons

What charge does an atom have after losing two electrons?

• 1+

• Neutral

• 2-

• 2+

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