ESAT Mock Chemistry Esat-chem-tc2-1
3 questions3 marks40Updated August 2026
The ESAT Mock Chemistry Esat-chem-tc2-1 paper in full: all 3 questions, each with its answer. ESAT is the Engineering and Science Admissions Test. Sit it cold under exam timing, mark it, then work back through anything you missed using the solutions below.
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Question 1
1 markElements , , and are defined as follows:
: a neutral atom whose ion has the electron configuration .
: the element in Period 4 whose atoms have exactly one electron in the fourth shell and a full third shell of 18 electrons (i.e. the outer shell configuration ends ).
: the halogen in the same period as .
: the noble gas in the same period as .
Which of the following statements is/are correct?
1. The compound formed between and has the formula .
2. is more reactive than sodium.
3. has 18 more protons than the noble gas in Period 3.
: a neutral atom whose ion has the electron configuration .
: the element in Period 4 whose atoms have exactly one electron in the fourth shell and a full third shell of 18 electrons (i.e. the outer shell configuration ends ).
: the halogen in the same period as .
: the noble gas in the same period as .
Which of the following statements is/are correct?
1. The compound formed between and has the formula .
2. is more reactive than sodium.
3. has 18 more protons than the noble gas in Period 3.
- A.1, 2 and 3
- B.1 only
- C.1 and 2 only
- D.none of them
- E.3 only
- F.1 and 3 only
- G.2 only
- H.2 and 3 only
Answer: F
Question 2
1 markAn atom of element has occupied electron shells, and its outermost shell contains exactly twice as many electrons as its innermost shell. Element is a non-metal.
Which one of the following correctly identifies element and a property of the element directly below it in the same Group?
Which one of the following correctly identifies element and a property of the element directly below it in the same Group?
- A. is Oxygen (Period 2); the element below it gains electrons more readily than
- B. is Silicon (Period 3); the element below it has electron configuration
- C. is Oxygen (Period 2); the element below it has electron configuration
- D. is Sulfur (Period 3); the element below it is more metallic in character than
- E. is Carbon (Period 2); the element below it has electron configuration
- F. is Sulfur (Period 3); the element below it has electron configuration
Answer: F
Question 3
1 markElement is a metal in Period 4 whose neutral atom has exactly 2 electrons in its outermost (fourth) shell, and whose third shell contains 8 electrons (i.e. it is not part of the d-block transition metals).
Element is the halogen in the period immediately below 's period.
Which of the following statements about and is/are correct?
1. and combine in a ratio to form an ionic compound.
2. The ion has the same electron configuration as an atom of Argon.
3. is less reactive than the halogen directly above it in the Periodic Table.
Element is the halogen in the period immediately below 's period.
Which of the following statements about and is/are correct?
1. and combine in a ratio to form an ionic compound.
2. The ion has the same electron configuration as an atom of Argon.
3. is less reactive than the halogen directly above it in the Periodic Table.
- A.1 only
- B.2 and 3 only
- C.1 and 2 only
- D.1, 2 and 3
- E.1 and 3 only
- F.none of them
- G.3 only
Answer: D