Atoms and Electron Configurations Unveiled

The video tutorial explains the structure of an atom, focusing on the nucleus and electron arrangement. It covers how electrons are organized in shells around the nucleus, with specific examples of elements like lithium, carbon, and magnesium. The tutorial also discusses how electron configurations relate to an element's reactivity and its position on the periodic table.

What is the relationship between the number of protons and electrons in a neutral atom?

• Protons are always more than electrons

• Electrons are always more than protons

• The number of protons equals the number of electrons

• Protons and neutrons are equal

How many electrons can the first energy level hold?

• Two

• Six

• Eight

• Four

What is the maximum number of electrons that can be held in the second shell?

• Ten

• Two

• Eight

• Four

How are electrons represented in dot and cross diagrams?

• As dots or crosses

• As circles

• As lines

• As stars

What is the electronic configuration of lithium?

• Li 1, 1

• Li 2, 2

• Li 1, 2

• Li 2, 1

How many electrons are in the outer shell of carbon?

• Two

• Four

• Eight

• Six

What is the electronic configuration of magnesium?

• Mg 2, 8, 2

• Mg 2, 2, 8

• Mg 8, 2, 2

• Mg 2, 8, 8

What determines the group number of an element on the periodic table?

• The number of protons

• The number of neutrons

• The number of electrons in the outer shell

• The atomic mass

Why do elements in the same group have similar reactivities?

• They have the same atomic mass

• They have the same number of protons

• They have the same number of neutrons

• They have the same number of electrons in the outer shell

Which energy level is filled first in an atom?

• The third level

• The second level

• The innermost level

• The outermost level