Learning Task No. 2: Using the Periodic Table of Elements, determine the miests asked in each guide question Write your answer in your notebook. Guide Questions: 1. Which elements are likely to lose electrons? 2. Which elements are likely to gain electrons? 3. Which type of elements are likely to have no electrical charge at all?
Answers & Comments
Answer:
Use the periodic table to answer the following questions.
(a) Identify an element with five electrons in the outer subshell.
(b) Identify an element that would tend to lose two electrons.
(c) Identify and element that would tend to gain two electrons.
(d) Identify the group having metal non-metal liquid as well as gas at the room
temperature.
Explanation:
Solution
(a) Chromium (Z=24) contains five electrons in 3d subshell.
(b) Magnesium (Z=12), an alkaline earth metal, can readily lose two electrons to form Mg
2+
.
(c) Oxygen (Z=8) gains 2 electrons to form O
2−
.
(d) Halogens (goup 17) contains metal (iodine), non metals (F,Cl and Br), liquid bromine and gases.