Atomic Structure
Which sub-atomic particle has a positive charge?
Protons (P+)
How many sub atomic particles are in an atom?
3
How many groups and periods are in the periodic table?
18 groups and
7 periods
name the series of elements at the bottom of the periodic table
lanthanides and actinides
Element in period 4 and group 3
Selenium -Se
What is the charge for an electron?
Negative (e-)
Which atoms are more stable?
Group 18 on the periodic table (gases nobles)
Which are the three (3) classification of elements in the periodic table?
metals
non-metals
and metaloids
Have properties of metal and non-metals
metaloids
What type of element is Zn (zinc)?
metal-transition metal
The electric charge for a neutrons is .......
neutral (0)
Calculate the number of protons for Magnesium (Mg) which has an atomic number of 12 and a mass of 24.305
12 protons
Where are located the groups of metals and nonmetal on the periodic table?
metals left side and non-metals right side
What does the number of the period represents?
number of energy levels or shells (rings) in the atom
Krypton (Kr) is a ____________________
Noble gas- non- metals
Which sub-atomic particle(s) are found in the nucleus?
Protons and neustrons
Where we can find the electrons?
electron cloud ; outside the nucleus
Which are the groups or types of metals?
alkali metals- group 1
alkaline earth metals- group 2
transition metals- group 3-12
What is a valence electrons?
electrons in the last energy level or shell
The only elements in liquid state are.....
Hg- mercury and Br- bromine
Mention the sub atomic particles with their massess
Protons 1AMU
Neutrons 1AMU
Electrons 0.00054 AMU
Where we can find the majority of the mass in an atom?
Nucleus
Which are the special groups of non-metals?
group 17- halogens
group 18- noble gases
What does the number of the group represents?
The number of valence electrons in the outermost (external) shell
Most of the metals are in ___________________state
gaseous