Question 1:
State the position of the following elements in the Modern Periodic Table of Elements.
(a) Lithium
(b) Silver
(c) Helium
(d) Gold
State the position of the following elements in the Modern Periodic Table of Elements.
(a) Lithium
(b) Silver
(c) Helium
(d) Gold
Answer:
(a) Group 1, Period 2
(b) Group 11, Period 5
(c) Group 18, Period 1
(d) Group 11, Period 6
Question 2:
Give two examples of elements in Group 17.
Give two examples of elements in Group 17.
Answer:
Fluorine/ chlorine/ bromine/ iodine/ astatine
(any two)
Question 3:
Element M has a proton number of 19. Based on the Modern Periodic Table of Elements, state the name of element M.
Element M has a proton number of 19. Based on the Modern Periodic Table of Elements, state the name of element M.
Answer:
Potassium
Question 4:
Element N is located in Group 15 and Period 3 in the Modern Periodic Table of Elements.
What is the electron arrangement for the atom of element N?
Element N is located in Group 15 and Period 3 in the Modern Periodic Table of Elements.
What is the electron arrangement for the atom of element N?
Answer:
2.8.5
Question 5:
Using suitable examples, state the formation of positive and negative ions from the atoms of their element.
Using suitable examples, state the formation of positive and negative ions from the atoms of their element.
Answer:
• Negative ions are formed when atom of an element accepts electrons from the atom of other elements. For example, chlorine atom accepts one electron from the atom of another element to form chloride ion.
• Positive ions are formed when the atom of an element donates electrons to the atom of another element. For example, sodium atom donates one electron to the atom of another element to form sodium ion.