Introduction to Atoms
All matter is formed from small particles called________.
What are atoms?
K
What is the symbol for potassium?
protons, neutrons and electrons
What are the three subatomic particles that make up an atom?
The name for the horizontal rows. (left to right)
What are the periods?
You have an unknown element that has lustre, is malleable and reacts with oxygen. It must belong to this family.
What are the alkali metals?
When a substance contains only one type of an atom it is called an ___________.
What is an element?
carbon
What does the symbol C represent?
Neutrons and protons are located in the ___________ of an atom.
What is the nucleus?
The name for the vertical columns.
What are groups?
This family is almost always non-reactive.
What are the noble gases?
All matter on Earth and in space is made up of ____________________ elements.
What is less than 100?
Lithium (correct/incorrect)
What is incorrect because names of elements do not start with a capital letter?
In a Bohr diagram, electrons in the outer ring are called ______________________.
What are valence electrons?
All elements in period two have two energy levels. (true or false)
What is true?
Bromine belongs to this family.
What is the halogen family?
Scientists had to wait until technologies that use _______________ were discovered before they could see atoms.
What are x-rays?
AL (incorrect/correct)
What is incorrect because if a symbol consists of two letters, the first is uppercase and the second is lowercase?
What is empty space?
All atoms in a group have a different number of valence electrons. (true or false)
What is false?
This element is located in group 4 and period 5.
What is zirconium?
They usually oversimplify what is actually happening in a system. They can not show all the variables/parts.
What is a disadvantage of models?
The following is a Bohr diagram for an element on the periodic table.
What is calcium?
This element has 16 neutrons.
What is phosphorous or sulfur?
Magnesium has a (smaller or larger) atomic radii than sodium.
What is smaller?
This element is a gas, it is a poor conductor of heat and electricity, it is very reactive with metals and oxygen and it is in period 3.
What is chlorine?