Chemistry * General Knowledge 1 Flashcards
Depending on the number of protons you get different ____
Elements
Water is made of _ & _
Hydrogen & Oxygen (H2O)
Atoms have ____ around them.
Atoms have Electron shells
All the elements in the periodic table that are in the same row, column, or group have the same number of ____ electrons
valence electrons.
Elements with the same number of valence electrons have
similar reactions in many chemical reactions.
The first group in the periodic table are called :
The Alkali metals
Name the alkali metals.
Lithium, Sodium, Potassium, Rubidium, Cesium, & Francium
List 4 things the Alkali metals have in common :
-They all have 1 valence electron
- All are shiny metals
- soft metals
- may cause a explosion sometimes
What is Isotopes?
Isotopes is when two or more elements have the same number if neutrons. When they have the same number of neutrons they can create a different element. Such as
Deuterium + Tritium = Hydrogen
Positive charged atoms are called - & negative charged atoms are called _.
Positive charged atoms are called Cations. & negative charged atoms are called Anions
All atoms that have a charge are called :
ions
When two or more atoms are together they make a molecule But when there are 2 or more different elements you get a ____
Compound
* Compounds behave completely different than what they are made of.
What are the 2 popular ways of writing molecules ?
- Lewis dot structure
- Molecular formula
How is a covalent bond formed?
When two atoms don’t have a complete outer shell, but get it by sharing thier electrons, that bond is called a covalent bond.
How is a covalent bond caused?
It is caused when one positive charge nucleus of (a atom is pulling the electrons of the other. This strength is called “Electronegativity”
