Scienct study pt 2

Question 1

What is the smallest unit of an element

Answer 1

atoms

Question 2

• Identify the three particles that make up the atom

Answer 2

Electrons, neutrons, protons

Question 3

how many electrons in the first shell?

Answer 3

2

Question 4

What is the maximum in the second and so on?

Answer 4

8

Question 5

Define the terms atomic number (Z) and atomic mass (A)

Answer 5

Atomic number = the number of protons in the nucleus of an atom, also determines its place in the periodic table.

Atomic Mass = the total mass of particles of matter in an atom

Question 6

calculate the number of neutrons in an atom using the equation:

Answer 6

N neutrons = atomic mass (rounded must be whole number) – atomic number

Question 7

What happens when energy is added

Answer 7

electrons may move to a higher energy level (further from the nucleus) and are said to be excited or in an excited state.

Question 8

Were elements with similar chemical properties grouped together eg Cl2, Br2 and I2.

Answer 8

yes

Question 9

What is the law of octaves?

Answer 9

Newlands placed elements in order of increasing atomic mass and noticed a repeating or periodic trend every eighth element