atoms 2 Flashcards
Who was Democritus and what did he believe?
He believe that atoms where made of extremely tiny parts.
What does Daltons Atomic Theory State?
All mater I made of atoms, atoms are invisible and indestructible, compounds are form by a combination of two or more different atoms.
What is the nucleus made up of? An what is its charge?
Protons and neutrons and a positive charge
According to Borh’s model how do electrons behave?
Circular orbit , Negative charge.
How are the elements arranged on the periodic table?
By increasing atomic number
what is ionization? how is an ion formed?
Ions are electrically charged particles formed when atoms lose or gain electrons
what types of ions group make? Group 2? Group 17? Group 16?
Group 1- Alkali metals
Group 2-alkaline earth metals
Group 17- halogens
Group 16- chalcogens
what does the atomic number tell you about the element?
The number of protons in the nucleus of an atom determines an element’s atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element.
what does the atomic mass tell you about the element?
An element’s or isotope’s atomic number tells how many protons are in its atoms. An element’s or isotope’s mass number tells how many protons and neutrons in its atoms.
Where are the Alkai metals?
Group 1
Where are the alkaline earth metals?
Group 2
where are the transition metals?
Group 3-12
where are the noble gases? what is different about them than other elements?
Group 17 lack of chemical reactivity
