Question

1. chromium is an example of an element that is a _. a. nonmetal b. transition metal c. metalloid d. noble gas 18.which of the following is a characteristic of the modern periodic table? a. the elements in each group have similar chemical properties b. a group is a horizontal row on the periodic table c. a period is a column on the periodic table d. the b groups contain the representative elements 19. which of the following elements is a metal? a. nitrogen b. fluorine c. argon d. strontium 20. identify the noble gas from the following list. a. nitrogen b. helium c. oxygen d. chlorine 21. identify the metalloid from the following list a. sulfur b. fluorine c. germanium d. copper 22. which element has physical and chemical properties similar to chlorine? a. br b. ar c. s d. p 23. what is the symbol of the element in group 14 period 5 a. bi b. v c. sn d. zr 24. what is the symbol for the element in group 15 period 3?

Explanation:

1. Chromium is in the d - block of the periodic table, which are transition metals.
2. In the modern periodic table, elements in the same group have similar chemical properties as they have the same number of valence electrons. A group is a vertical column, a period is a horizontal row, and the A groups contain representative elements.
3. Nitrogen and fluorine are non - metals, argon is a noble gas, and strontium is an alkaline earth metal.
4. Helium is a noble gas. Nitrogen is a non - metal, oxygen is a non - metal, and chlorine is a non - metal.
5. Sulfur is a non - metal, fluorine is a non - metal, germanium is a metalloid, and copper is a metal.
6. Elements in the same group have similar physical and chemical properties. Chlorine and bromine are in Group 17 (halogens).
7. The element in Group 14 Period 5 is tin with the symbol Sn.
8. The element in Group 15 Period 3 is phosphorus with the symbol P.

Answer:

1. b. Transition metal
2. a. The elements in each group have similar chemical properties
3. d. Strontium
4. b. Helium
5. c. Germanium
6. a. Br
7. c. Sn
8. (No options provided for this one, but the answer is P)