5th - Science Unit 1 Lesson 1 REVIEW Flashcards
(20 cards)
What is the particle in an atom that has a negative charge?
Electron
What is the smallest unit of an element that retains that element’s properties?
Atom
What is substance that cannot be broken down into something simpler?
Element
What is anything that has mass and takes up space?
Matter
What is two or more atoms that are joined into one particle?
Molecule
What is in the nucleus of atom and has no electric charge?
Neutron
What is the center of an atom?
Nucleus
What is in the nucleus of an atom and has a positive electrical charge?
Proton
Every substance on Earth is made of one or more what?
Elements
What did Dmitri Mendeleev creat in the 1860’s?
The Periodic Table
One important property of an element is its state at what?
Room temperature
Another important property is the way it what with other elements?
Combines or mixes chemically
A third property is the element’s classification. What are the classifications?
Nonmetal, metal, and metalloid
Each element is composed of tiny particles called what, the smallest units that retain the element’s properties?
Atoms
What is the center of an atom?
Nucleus
What does the nucleus contain?
Protons and neutrons
What else do atoms contain that move around the nucleus?
Electrons
How do you determine an element’s atomic number?
Count its protons
How do you determine an element’s atomic mass?
Counts it’s protons and neutrons
What are the letters in the center of each element box?
They are the element’s symbol
