Phase Changes
The phase change name from solid to liquid.
What is freezing?
The whole number on an element symbol.
What is the atomic number?
OR
What is the amount of protons?
The name of the very reactive family in group 1.
What are alkali metals.
Electrons on the outermost shell of an atom.
What is a valence electron?
Cutting your hair is a __ change.
What is a physical change?
The phase change name from liquid to gas.
What is evaporation?
The decimal number on an element symbol.
What is atomic weight?
This element family is known to be nonreactive because of a full outer shell.
What are the noble gases?
This happens as you move from left to right across a period to the number of protons in an atom’s nucleus.
What is the number of protons increases?
The atomic number of an atom tells us this.
What is the amount of protons in an atom?
A gas releases heat and changes into a liquid.
What is condensation?
The atomic mass is the sum of these two subatomic particles.
What is protons plus neutrons?
This element family is known to be reactive nonmetals on the right side of the periodic table.
What are halogens?
This happens as you move down a group on the periodic table to the number of electron energy levels in an atom.
What is the number of energy levels increases?
A student burns a piece of paper and tears another piece of paper into small pieces. Which change is a chemical change, and what evidence supports your answer?
Burning the paper is a chemical change because new substances, such as ash and gases, are formed. Tearing the paper is a physical change because the paper’s composition stays the same.
The phase change name from solid to gas.
What is sublimation?
The columns of the periodic table are called this. There are __.
What is a group? There are 18.
The name of group 2's less reactive metals.
What are alkali earth metals?
Which atom has a larger atomic radius: lithium (Li) or potassium (K)? Explain why.
Potassium (K), because it has more electron energy levels.
What element family is hydrogen? Why is it placed above the alkali metals?
Hydrogen is not in any element family. It is placed above alkali metals because of its electron arrangement.
Heat is removed from a gas super quickly, this is the phase change name and the state of matter it becomes.
What is deposition? What is a solid?
The rows in the periodic table are called this. There are _.
What is a period? There are 7.
An unknown element is a shiny metal that reacts strongly with water. It has one valence electron and is found in Group 1. Which element family does it belong to, and why is it so reactive?
Alkali metals. They have one valence electron, which they can easily lose during a chemical reaction.
As you move from left to right across a period, the atomic radii of atoms generally get smaller. What causes this trend?
The number of protons increases, creating a stronger attraction between the nucleus and the electrons and pulling the electrons closer to the nucleus.
Two elements are in the same family. Element A is above Element B on the periodic table. Which element generally has the larger atomic radius, and why?
Element B, because it has more electron energy levels.