Classifying Matter
Is salt an element, compound, or mixture?
compound
The modern periodic table of elements is organized according to this.
What is increasing atomic number?
Name the 3 sub atomic particles.
protons, neutrons, electrons
The atomic number tells you this.
What is the number of protons (and electrons) an atom of an element should have?
The only nonmetal on the left side of the periodic table is...
Hydrogen
A substance that is composed of only one type of atom is called
an element
All elements in a group are similar because they have....
the same number of valence electrons
electrons
Boron's atomic number is 5 and it has 6 neutrons. How many protons does it have?
5
How is the father of the current periodic table?
Mendeleev
A student observes a multicolored substance. They are able to separate the colors with a filter. How would you classify this substance?
heterogeneous mixture
Describe Sodium based on its location on the periodic table. Metal, nonmetal, metalloid? Reactivity?
highly reactive metal
The electrons in the outer energy level are called this.
What are valence electrons?
Fluorine has 9 protons, 9 electrons, and 10 neutrons. What is fluorine's atomic mass?
19
What subatomic particle identifies an element?
Proton
Pure substances(can't be broken into anything simpler by physical means) that contain more than one type of atom are called...
compounds
Where are the most reactive nonmetals on the periodic table?
halogens, right side of the table
How would you describe the density of an atom's nucleus?
Very dense...it occupies very little volume(space) but contain most of the atom's mass(stuff)
An element's atomic number is 47 and its atomic mass is 108. How many electrons does it have?
47
How many valence electrons does an atom of nitrogen have?
5
Lemonade is considered a _________________________________ because the it looks the same throughout, but can be separated.
homogeneous mixture
Name an element on the periodic table that would have chemical properties similar to Calcium.
Beryllium, Magnesium, Sr, Barium, Ra
How would you describe the density of the electron cloud?
not dense, it occupies most of the atom's volume(space) but contains very little of its mass(stuff)
How many neutrons are in an atom of potassium?
20
Bromine has 7 valence electrons. What group would Bromine most readily bond with?
Alkali metals
How would air be classified?
homogeneous mixture
What observations were made that lead to the arrangement of the periodic table?
repeating patterns of chemical and physical properties
An atom is the smallest unit of an....
How many neutrons does an atom of hydrogen have?
0
Most elements on the right side of the periodic table are what state of matter?
gas