Periodic Table 1
What is matter?
Anything that has mass and takes up space
What metal is a liquid at room temperature?
Mercury
Name two elements that you would expect to have similar chemical properties...
answer will vary
An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
125
What element is in the 7th group and 4th period?
Manganese
Name all 7 diatomic elements
HNOFClBrI
What is mass number
Number of protons and neutrons
What element has the smallest atomic radius?
helium
What are 3 physical properties of metals?
luster, malleable, ductile, good conductors, donate electrons, high density, high melting point
Who organized the periodic table by increasing atomic mass?
Mendeleev
What is the name of the 3 main types of elements on the periodic table?
metals, non-metals, metalloids
Who organized the periodic table by increasing atomic number?
How many electrons does a selenium atom with a -2 charge have?
36
What are three physical properties of non-metals?
not shiny, not malleable (brittle), not ductile, poor conductors (good insulators), gain electrons, low density, low melting point
What element is located at the 6th period and 2nd group?
Barium
What are the horizontal rows on the Periodic Table called?
Neutral atoms have equal...
protons and electrons
Ions have unequal...
protons and electrons
Physical changes do not change the identity of a substance
What is the first element in period 3?
Sodium
The majority of the elements on the periodic table are classified as this:
metals
Argon belongs to what specially named group?
noble gases
Which family (name, not number) is the most reactive metals family with one valence electron?
Alkali Metals
Group 17 has a special name called...
Halogens
How many electrons does a neutral atom of iodine have?
53