Atomic Structure and Subatomic Particles

The video tutorial introduces the concept of atoms as the smallest unit of matter, retaining the identity and chemical properties of elements. It explains the structure of atoms, consisting of protons, neutrons, and electrons, and how these subatomic particles interact. The tutorial covers the significance of atomic number in determining an element and the role of electrons in chemical reactions. It provides examples of various atoms, such as helium, copper, and oxygen, and explains how atomic mass is calculated based on the number of protons and neutrons.

What is the smallest unit of matter that retains the identity of an element?

• Molecule

• Atom

• Proton

• Electron

Which subatomic particle has a positive charge?

• Neutron

• Proton

• Nucleus

• Electron

What determines the element of an atom?

• Number of neutrons

• Atomic mass

• Number of protons

• Number of electrons

In a neutral atom, the number of electrons is equal to the number of which subatomic particle?

• Protons

• Nucleus

• Molecules

• Neutrons

How many protons does a helium atom have?

• 1

• 2

• 4

• 8

What is the atomic number of oxygen?

• 6

• 8

• 16

• 18

How is the atomic mass of an element calculated?

• Sum of electrons and protons

• Sum of protons and neutrons

• Sum of all subatomic particles

• Sum of neutrons and electrons

What is the atomic mass of fluorine if its atomic number is 9?

• 36 amu

• 18 amu

• 27 amu

• 9 amu

If an element has an atomic number of 26, what is its atomic mass assuming it has the same number of neutrons?

• 26 amu

• 52 amu

• 78 amu

• 104 amu

Which element has an atomic number of 3?

• Lithium

• Beryllium

• Boron

• Carbon