Electron Configurations and Periodic Table

The video tutorial explains how to identify an element on the periodic table using its electron configuration, specifically 1s2. It presents two methods: counting electrons to match with protons for neutral elements, and using orbital blocks on the periodic table. The tutorial concludes by confirming helium as the element with the configuration 1s2.

What is the main focus of this video tutorial?

• Finding elements using electron configurations

• Studying atomic mass

• Learning about chemical bonds

• Understanding chemical reactions

How many electrons does the element with the configuration 1s2 have?

• Three

• Four

• One

• Two

Which element on the periodic table has two protons?

• Helium

• Lithium

• Hydrogen

• Beryllium

What is the electron configuration of a neutral helium atom?

• 2s1

• 1s1

• 1s2

• 2s2

What happens to lithium when it loses an electron?

• It becomes 2s2

• It becomes 1s1

• It becomes 1s2

• It becomes 2s1

Which group on the periodic table ends in s1?

• Group 1

• Group 2

• Group 4

• Group 3

How many electrons can the d orbital hold?

• 2

• 6

• 10

• 14

Which orbital block holds up to six electrons?

• s

• p

• d

• f

What is the electron configuration of helium?

• 2s1

• 2s2

• 1s2

• 1s1

Who is the presenter of this video?

• Dr. D

• Dr. C

• Dr. B

• Dr. A