Element Symbols
Al
Aluminum
Most naturally occurring pure elements are in what group (or form)?
Metals
Was Mendeleev's periodic table immediately accepted by the scientific community?
No, they were skeptical.
Most metals are ___ at room temperature.
solids
Refer to a periodic table. What type of element is manganese?
metal
Fe
Iron
Why is alchemy important today?
Alchemist discovered and purified substances later found to be chemical elements.
What was unique about Mendeleev's element classification method?
He left blank spaces for undiscovered elements
Neutral, ground-state elements in a family have the same...
number of valence electrons
Refer to a periodic table. What type of element is silicon?
metalloid
Na
sodium
All naturally occurring diatomic elements are in what group (or form)?
nonmetals
What declares that properties of elements vary with their atomic numbers in a periodic way?
The periodic law
Which family of all nonmetals is most reactive?
Halogens
Refer to a periodic table. What is the family name for the group containing potassium?
Alkali metals
K
potassium
What element in group 1A does not have a polyatomic molecular form?
hydrogen
How many natural and artificial elements make up all known compounds?
118
The three main kinds of elements present on the periodic table are ...
metals, nonmetals, metalloids
Which of these families is mostly metals....boron family, carbon family, or halogens?
boron family
Pb
lead
What are 3 factors that influenced modern element names?
element color, heavenly bodies,, and famous scientists
What most influences the chemical & physical properties of an element?
The electron structure of its atoms
Mixtures of metals are called...
alloys
An element is a pure substance made of ____ kind of atom.
one