Nature of The Atom
What are the 3 subatomic particles found in an atom?
protons, neutrons and electrons
The periodic table of the elements is arranged according to ____________ ____________.
atomic number
The element with the symbol Hg?
mercury
What category does the element with atomic number 32 belong to?
Germanium is a metalloid
What is the atomic mass of carbon?
12.011 amu
Which particle has almost no mass and a negative (-) charge?
An electron
The rows of the periodic table are called ________________.
periods
The elements with atomic numbers 47 and 79?
silver and gold
To what category does the element with the symbol Se belong?
Selenium is a nonmetal.
In what group is magnesium found?
Group 2 or the alkaline earth metals
Which particle has a mass of 1 amu and a positive (+) charge?
A proton
The columns of the periodic table are called _______________.
groups
The element with an atomic mass of 1.008.
hydrogen
To what category does the element with atomic mass 226.025 amu belong?
Radium is a metal.
In what period is zinc found?
period 4
Which particle has a mass of slightly more than 1 and no (0) charge?
A neutron
The atomic number of an element always tells us the number of ___________ in that element's atoms.
protons
The element that is the noble gas in period 3
argon
To what category does the element in group 14 and period 2 belong?
Carbon is a nonmetal.
If the alkali metals are more reactive than the transition metals, which metal is the more reactive one, cesium or titanium?
Cesium it is an alkali metal.
The atom is composed of mostly ____________ ____________.
empty space
The ___________ ______________ minus the atomic number tells us the number of neutrons found in an element's atoms.
mass number
The element that is a metalloid, a member of group 14 and a member of period 3.
silicon
To what category does the actinide series element with atomic number 92 and atomic mass 238.029 belong?
Uranium is a metal.
The element that is the halogen with the smallest atoms is _______________.
fluorine