States of Matter
This state of matter has a definite shape and definite volume.
solid?
This Greek philosopher first proposed that matter is made of indivisible particles called “atomos.”
Democritus?
Elements in the same column are called this.
a group?
: Lewis dot structures use these to represent valence electrons.
What are dots?
This pH value is considered neutral.
7
The temperature at which a solid becomes a liquid.
melting point?
He developed the first modern atomic theory in the early 1800s.
John Dalton?
The elements that are in the same row are called?
a Period?
In the Lewis structure for water (H₂O), the oxygen atom has this many lone pairs.
2?
Blue litmus paper turning red indicates?
It means it's a Acidic solution
This high-energy state of matter, often called the fourth state, is found in stars.
plasma?
Who was the first person who made the first molded to an atom?
j.j Thomphane
The most reactive halogen is this.
fluorine?
The maximum number of electrons that can surround most atoms in a Lewis structure.
8 (the octet rule)?
what is the pH of the solution blood.
It has the pH of 7.4
The temperature at which the vapor pressure equals atmospheric pressure.
boiling point?
which person created the gold foil experiment?
Ernest Rutherford
These elements have the smallest atomic radii in their periods.
noble gases?
In the Lewis structure for carbon dioxide (CO₂), the carbon atom forms this many double bonds.
2?
This citrus fruit juice is strongly acidic with a pH near 2.
lemon juice
Tell the answer to this. Why do the particles in atom vibrate?
Because it's due to the attraction.
Who created the teroy to the orbit in different fixed shells?
Niels Bohr
Electronegativity is a measure of this tendency.
attracting electrons in a bond?
This element is an exception to the octet rule, often stable with only 2 valence electrons in its Lewis structure.
hydrogen?
This household cleaner has a pH around 13.
bleach?