1
Sam is studying the position of an unknown element in the periodic table. He determines that the element has an electronic configuration of 2,8,7. In which group and period is this element?
2
Nora is studying the properties of noble gases. She knows that they are generally unreactive due to their stable electron configuration. Which noble gas is used in balloons because of its low density?
4
Which group elements are soft and highly reactive?
5
Victor is studying the melting points of elements. He knows that metals generally have high melting points, while non-metals have lower melting points. Which of the following has the highest melting point?
7
The periodic table is arranged in order of increasing:
8
Which periodic trend explains reactivity of metals?
9
Ming is studying the density of elements in Group 1. He notes that lithium floats on water, while sodium also floats. As we move down the group, the density of alkali metals generally:
10
Quinn is studying the halogens, which are Group 17 elements. He knows that fluorine is a pale yellow gas and chlorine is a greenish-yellow gas. What is the appearance of bromine at room temperature?