Matters And Chemical Bonding, Elements And The Periodic Table

Question 0

What is the modern view of the atom?

Answer 0

The atom is…

1. The smallest particle of an element
2. About 10 (-10) m in diameter
3. Made up of even smaller particles called subatomic particles (protons, neutrons, electrons)
4. It is inconvenient to measure the mass of subatomic using units such as grams.

Question 1

State the atomic theory of matter from John Dalton.

Answer 1

1. All matter is made up of tiny particles called atoms which cannot be created, destroyed, or divided into smaller particles.
2. The atoms of one element cannot be converted to atoms of any other element.
3. The atoms of one element have the same properties- these properties are different from the atoms of another element.
4. Atoms of different elements combine in specific proportions to form compounds.

Question 2

What do we use to measure the mass of subatomic particles?

Answer 2

Atomic mass unit (symbol u). A proton has a mass of about 1u, which is equal to 1.66 * 10(-24) g.

Question 3

What is the formula for the calculation of neutrons?

Answer 3

Number of neutrons = Mass number (A) - Atomic number (Z)

Question 4

Isotopes

Answer 4

Atoms of an element that have the same number of protons but different numbers of neutrons.

Question 5

What the Average Atomic Mass take into account?

Answer 5

It takes into account the abundance of each isotope within the element.

Question 6

Describe radioactivity?

Answer 6

Some isotopes are unstable than others and their nuclei can release energy and subatomic particles.

Question 7

Atomic mass units are relative measure defined by…

Answer 7

the mass of carbon-12. One atom of carbon-12mis assigned a mass of 12u. The masses of all other atoms are defined by their relationship to carbon-12.

Question 8

What is the formula for AAM?

Answer 8

AAM = (mass1)(%abundance 1) + (mass2)(%abundance2) + …