SACE Stage 2 Chemistry - 1.5 Atomic Absorption Spectroscopy AAS

What are flame tests and atomic absorption spectroscopy (AAS) used for?

• To determine the boiling point of elements

• To identify elements by their unique electron transfer between atomic energy levels

• To measure the pH level of substances

• To observe the crystalline structure of minerals

Why are the wavelengths of radiation emitted and absorbed by an element unique to that element?

• Because they depend on the temperature of the element

• Because they are the same for all elements

• Because they are unique to that element and can be used to identify it

• Because they depend on the phase (solid, liquid, gas) of the element

What does the electron configuration of an atom or monatomic ion of any of the first 38 elements in the periodic table provide?

• The atomic mass of the element

• The number of protons in the nucleus

• The arrangement of electrons in shells and subshells around the nucleus

• The number of neutrons in the nucleus

According to the Bohr model, how do electrons transition between energy levels?

• By changing their spin

• By absorbing or emitting electromagnetic radiation

• By moving in a fixed orbit at a constant speed

• By colliding with other electrons

What is the principle behind the use of atomic absorption spectroscopy in identifying elements in a sample?

• It measures the weight of the elements

• It determines the melting point of the elements

• It relies on the unique wavelengths of radiation absorbed and emitted by the elements

• It observes the color changes in chemical reactions

How are electrons distributed in shells and subshells according to their energy levels?

• Randomly, without any specific order

• Based on their atomic number

• In order of decreasing energy, starting with the highest energy levels

• In order of increasing energy, starting with the lowest energy levels

What is the maximum number of electrons in the M shell (n = 3)?

• 2

• 8

• 18

• 32

How many electrons can be in the d subshell?

• 3

• 5

• 7

• 10

What is the maximum number of electrons in the N shell (n = 4)?

• 18

• 32

• 50

• 2n²

What is the general formula for calculating the maximum number of electrons in a shell?

• n

• n²

• 2n

• 2n²