As you move from left to right across the periodic table, elements
What is become less metallic?
100
Most of the elements on the left side of the periodic table are
What is metals
100
The three main groups of elements are metals, nonmetals, and
What is semiconductors?
100
When did Mendeleev create a new row in his periodic table
What is when the chemical properties were repeated.
100
What happens to the particles of a substance when it condense
What is particles slow down and clump together?
200
As you move from up to down in a column of the periodic table, elements have
What is a higher atomic number?
200
Elements found in the same group have the same number of
What is valence electrons?
200
Group 17 elements form
What is anions?
200
In Mendeleev's periodic table, elements in each column had similar
What is properties?
200
You are asked to find the volume of a cube that is 2.5 cm high, 2.65 cm wide, and 3.456 cm long. How many significant figures should you show in your answer?
What is 2 significant figures?
300
Magnesium (Mg) is located to the right of sodium (Na) because Mg has
What is has more protons?
300
Most elements are
What is metals?
300
Noble gases are considered
What is stable or inert?
300
Mendeleev studied the properties of the elements and looked for
What is patterns?
300
A mole is an SI unit that describes the
What is the amount of a substance?
400
In his version of the periodic table, Mendeleev based his arrangement of the elements on an element's
What is atomic mass
400
Carbon and other nonmetals are found in which area of the periodic table?
What is on the right side?
400
How do you know potassium, and alkali metal, is highly reactive
What is it has one valence electron?
400
What is Mendeleev known for
What is publishing the first periodic table?
400
The SI unit for measuring temperature is the
What is a Kelvin?
500
Most nonmetals
What is brittle?
500
Atoms that gain or lose electrons are called
What is ions?
500
Most halogens form compounds by
What is gaining an electron to form a negative ion?