Science Final Semester 1 Flashcards
What are valence electrons?
An electron that is found in the outermost shell of an atom. It’s important because it determines an atom’s chemical properties. A quick way to determine the number valence electrons to look at it’s group number.
What is matter? What two properties does all matter have?
Matter is anything that has mass and takes up space. All matter has mass/volume.
Why are valence electrons important?
It’s important because it determines an atom’s chemical properties.
What is a quick way to determine the number of valence electrons it has?
A quick way to determine the number valence electrons to look at it’s group number.
The periodic is arranged by increasing …….. ……. And by the ….. Of the elements.
Atomic number and mass
The vertical columns if the periodic table are called …. Or …….
Groups or families
Elements in these groups have …… physical and chemical ……
Similar, properties
The horizontal rows are called ……
Periods
……. Are on the left side of the periodic table and …… Are on the right side of periodic table. …… Are on the zig zag line.
Metals, non metals, and metalloids
In an atom the number of ….. Will be the same as the number of the ……
Protons and electrons
Describe 5 characteristics of metals.
- malleable
- ductility
- shiny
- good conductor of electricity
- God conductors if heat
Describe 5 characteristics of non metals.
- brittle
- dull
- not malleable
- poor conductors of electricity
- poor conductors of heat
Describe 4 characteristics of metalloids.
- some shiny
- semiconductors
- somewhat malleable/ductile
- some dull
What is difference between a physical and chemical property?
A physical property is a characteristic of a substance that doesn’t involve a chemical change while a chemical property is the property of matter that describes its ability to participate in chemical reactions.
What is volume?
The amount space that an object takes up.
