How many ELECTRONS can the first ring/orbital shell hold?
The first ring/orbital shell can hold a maximum of 2 ELECTRONS
How many electrons are needed to fill up the 2nd and 3rd orbital shells of an atom?
8
On a periodic table, what do rows are also called...
periods
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
What main group of elements have solids, liquids and gases?
non-metals
What is mass number
Number of protons and neutrons
What is true about the atomic mass of the elements as the atomic number increases?
Atomic mass also increases
What are 3 physical properties of metals?
luster, malleable, ductile, good conductors, donate electrons, high density, high melting point
What element was named for the creator of the periodic table?
101 - Mendelevium
What is the first element in period 3?
Sodium
What is the name of the 3 main types of elements on the periodic table?
metals, non-metals, metalloids
What two elements are liquids at room temperature?
Mercury and Bromine
The staircase follows what elements down the periodic table?
metalloids
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
Chlorine has an atomic mass of...
35.5
What are the elements from 89 -103 called?
Actinoids
What is the heaviest alkaline earth metal?
Radium
What element has the symbol K?
Potassium
How many protons does a copper atom have?
29
Elements in red are in what state of matter?
gas
What is the name of the group 1 family?
alkali metals
How many elements have been named?
118
Argon belongs to what specially named group?
noble gases
Which family (name not number) is the most reactive metals family?
Alkali Metals
Group 17 has a special name called...
Halogens
How many electrons does a neutral atom of iodine have?
53
What are the two letters not used for symbols on the periodic table?
J and Q