four main - group elements a, b, c and d are highlighted in the outline of the periodic table below: list…
four main - group elements a, b, c and d are highlighted in the outline of the periodic table below: list these elements below in order of decreasing atomic radius. for example, if an atom of a is the biggest, and b the next biggest, then your list should start a, b, ... important: dont try to figure out exactly which elements are marked, and then use your knowledge of the properties of each specific element. you dont need to. you will also be marked wrong for any answer, correct or not, that cant be determined from only the rough location of each marked element in the periodic table.
Answer
Explanation:
Step1: Recall atomic - radius trend
Atomic radius increases down a group and decreases across a period.
Step2: Analyze vertical position
Elements (a) and (c) are in the same group with (a) below (c), so (a>c).
Step3: Analyze horizontal position
Elements (b) and (d) are in the same group with (b) below (d), so (b > d). Also, (c) and (d) are in the same period with (c) to the left of (d), so (c>d), and (a) and (b) are in different periods and groups, but since (a) is in a lower - numbered period and more to the left, (a>b).
Answer:
(a,b,c,d)