1
Atomic radius generally decreases across a period because:
2
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:
3
Samir is learning about carbon dating. He discovers that it is used to determine the age of ancient artifacts. Which isotope is used in carbon dating?
5
Uma is comparing the thermal conductivity of metals and non-metals. She knows that metals are good conductors of heat. Which of the following is a non-metal with good thermal conductivity?
6
Diana is learning about the quantum mechanical model. She understands that it describes electrons in terms of orbitals. What is an orbital?
8
Rachel is studying the adaptability of metals. She knows that metals can be hammered into sheets (malleability) and drawn into wires (ductility). Which of the following is a property of metals?
9
The study of atomic structure helps to understand:
10
Fatima is reviewing atomic structure and subatomic particles. She knows that electrons are found outside the nucleus. What is the approximate mass of an electron compared to a proton?