Question

9 multiple choice 1 point
which of the following is a characteristic of metals?
○ not shiny
○ brittle
○ malleable and ductile
○ forms negatively charged ions
clear my selection
10 multiple choice 1 point
atomic radii increases in a column from ____ to ____.
○ left; right
○ right; left
○ top; bottom
○ bottom; top
clear my selection

Explanation:

Question 9

Metals are typically shiny, not brittle (brittle is more of a non - metal or metalloid property), and they tend to form positively charged ions (cations) by losing electrons. One of the key characteristics of metals is that they are malleable (can be hammered into sheets) and ductile (can be drawn into wires).

In the periodic table, when we look at a column (group), as we move from top to bottom, the number of electron shells increases. Since atomic radius is related to the distance from the nucleus to the outermost electrons, with more electron shells, the atomic radius increases. When moving left to right across a row (period), the atomic radius generally decreases. So atomic radii increase in a column from top to bottom.

Answer:

C. malleable and ductile

Question 10