Activity 2.5:
Finding the mystery code
1. In groups, answer the following questions:
(a) The nucleon number and the proton number of fluorine element are 19 and 9 respectively. Is the following statement true or false?
The atom of this element has 9 electrons and 9 neutrons in its nucleus.
(b) Atom X has 11 protons and 12 neutrons. Find the nucleon number of this atom.
(c) What is the proton number of an atom of nitrogen element that has 7 electrons?
(d) The standard representation of an atom of oxygen element is 168O. This atom accepts electrons to form an oxide ion, O2–. How many electrons are accepted by an oxygen atom to form an oxide ion, O2–?
(e) The nucleus of atom Y has the charge +4 and contains 5 neutrons. State the nucleon number of element Y.
(f) A calcium atom has 20 protons and its nucleon number is 40. A calcium ion, Ca2+ is formed when a calcium atom donates 2 electrons. State the number of neutrons in a calcium ion, Ca2+.
(g)
An atom of element W has 3 electrons and 4 neutrons. What should the number in the box be, to represent the atom of element W?
2. Scan QR Code or visit the website provided to obtain the code guidance.
3. Get the mystery code.
Answer:
1. (a) False
(b) Nucleon number = 11 + 12 = 23
(c) Proton number = 7
(d) Number of electrons received = 2
(e) Nucleon number = 4 + 5 = 9
(f) Number of neutrons = 40 – 20 = 20
(g) Number of protons = 3
3. BOHRIUM
Finding the mystery code
1. In groups, answer the following questions:
(a) The nucleon number and the proton number of fluorine element are 19 and 9 respectively. Is the following statement true or false?
The atom of this element has 9 electrons and 9 neutrons in its nucleus.
(b) Atom X has 11 protons and 12 neutrons. Find the nucleon number of this atom.
(c) What is the proton number of an atom of nitrogen element that has 7 electrons?
(d) The standard representation of an atom of oxygen element is 168O. This atom accepts electrons to form an oxide ion, O2–. How many electrons are accepted by an oxygen atom to form an oxide ion, O2–?
(e) The nucleus of atom Y has the charge +4 and contains 5 neutrons. State the nucleon number of element Y.
(f) A calcium atom has 20 protons and its nucleon number is 40. A calcium ion, Ca2+ is formed when a calcium atom donates 2 electrons. State the number of neutrons in a calcium ion, Ca2+.
(g)
An atom of element W has 3 electrons and 4 neutrons. What should the number in the box be, to represent the atom of element W?2. Scan QR Code or visit the website provided to obtain the code guidance.
3. Get the mystery code.
Answer:
1. (a) False
(b) Nucleon number = 11 + 12 = 23
(c) Proton number = 7
(d) Number of electrons received = 2
(e) Nucleon number = 4 + 5 = 9
(f) Number of neutrons = 40 – 20 = 20
(g) Number of protons = 3
3. BOHRIUM