Chapter 2 Flashcards
Matter is
Anything that has mass and takes up space
What 4 states does matter exist?
Solid, liquid, gas, plasma
All matter is composed of basic substances called?
Elements
What 6 elements make up 95% of organisms body weight?
Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
How many known naturally occurring elements are there?
92
Protons charge?
Positive
What is the smallest part of an element?
Atom
Neutrons charge?
No charge
Electron charge?
Negative
Atomic theory is?
Idea that elements consist of tiny particles called atoms
The 3 subatomic particles that make up atoms?
Proton, Neutron, Electron
What 2 subatomic particles are located in the nucleus?
Protons and Neutrons
Electrons are arranged where?
Outside the atom in shells
The rows on the periodic table arranged horizontally are called?
Periods
The vertical columns on the Periodic Table are called?
Groups
The atomic number is?
The amount of protons and electrons
Mass number is?
Total amount of protons and neutrons in the nucleus
T/F It takes energy to hold electrons in place?
True
The atoms in group VIII are?
Noble gases
The first electron shell can only hold how many electrons?
2