Atomic Theory
Rutherford suggested that this dense central region of the atom is made up of protons and neutrons.[1]
Answer: What is the nucleus
Too few electrons on an atom produce this type of charge.[1]
Answer: What is a positive charge?
In the magnesium entry, the number 12 is this.[1]
Answer: What is the atomic number
Group 17 elements are highly reactive non-metals and are called this.[1]
Answer: What are halogens
These elements are typically solid at room temperature (except mercury), shiny, and good conductors.[1]
Answer: What are metals
Bohr’s model places these negatively charged particles in energy levels or shells around the nucleus.[1]
Answer: What are electrons
An atom or group of atoms with a net electric charge is called this.[1]
Answer: What is an ion?
Some periodic table entries show common electric charges formed by the element; these are called this.[1]
Answer: What are ion charges
Group 18 elements are stable, unreactive non-metals and belong to this family.[1]
Answer: What are noble gases
These elements are often gases or brittle solids and are poor conductors of heat and electricity.[1]
Answer: What are non-metals
Particles such as protons, neutrons, and electrons are collectively called this.[1]
Answer: What are subatomic particles
In the notation 15N3-1, the “15” represents this value.[1]
Answer: What is the mass number?
The symbol “O” stands for this non-metal element needed for breathing.[1]
Answer: What is oxygen?
Non-metallic elements that are strongly reactive belong to this group, which includes fluorine and chlorine.[1]
Answer: What are the halogens
These elements can be shiny or dull solids and may conduct electricity but are poor conductors of heat.[1]
Answer: What are metalloids
In Bohr’s model, electrons can jump back and forth between these, releasing or absorbing light.[1]
Answer: What are energy levels (or shells)?
In the notation 15N3-, the “7” shown underneath represents this value.[1]
Answer: What is the atomic number?
The symbol “Na” stands for this metal that reacts strongly with water.[1]
Answer: What is sodium?
Metallic elements that are strongly reactive, such as sodium and potassium, belong to this family.[1]
Answer: What are the alkali metals
This term describes a substance that can be hammered or rolled into sheets.[1]
Answer: What is malleable?
This subatomic particle has a positive electric charge and is found in the nucleus.[1]
Answer: What is a proton?
In 15N3-, the “3–” indicates this about the electrons.[1]
Answer: What is that the atom has 3 more electrons than protons
The symbol “Cl” stands for this pale yellow-green gas used to kill bacteria in pools.[1]
Answer: What is chlorine?
Metallic elements that are reactive but not as much as group 1 belong to this family.[1]
Answer: What are the alkaline earth metals?
This term describes a substance that can be drawn out into wires.[1]
Answer: What is ductile?