Atomic Structure and Subatomic Particles

This video tutorial covers the basics of subatomic particles in atoms, focusing on how to count protons, neutrons, and electrons using the periodic table. It explains the significance of atomic numbers and mass, and how to represent elements with symbols. The tutorial includes examples and practice problems to reinforce understanding.

What does the atomic number of an element represent?

• The number of protons in the nucleus

• The number of electrons in the outer shell

• The total mass of the atom

• The number of neutrons in the nucleus

If a carbon atom has an atomic number of 6, how many protons does it have?

• 6

• 4

• 8

• 12

How is the atomic mass of an element generally calculated?

• By adding the number of protons and neutrons

• By measuring the weight of the atom

• By adding the number of protons and electrons

• By averaging the mass of all isotopes

What is the atomic mass of carbon when rounded to the nearest whole number?

• 14

• 13

• 12

• 11

In the symbol representation of an element, what does the superscript number indicate?

• The charge of the atom

• The atomic number

• The mass number

• The number of electrons

For sodium (Na), if the atomic number is 11, how many protons does it have?

• 10

• 11

• 12

• 13

In a neutral atom, how do the number of protons and electrons compare?

• Protons are always more than electrons

• It varies depending on the element

• Electrons are always more than protons

• They are equal

For oxygen with an atomic number of 8, how many electrons does it have in a neutral state?

• 6

• 7

• 8

• 9

How many neutrons are present in phosphorus if its atomic mass is 31 and atomic number is 15?

• 15

• 16

• 14

• 17

What is the purpose of the practice section in the video?

• To memorize the periodic table

• To practice counting subatomic particles

• To learn about chemical reactions

• To understand electron configurations