chemistry Flashcards
What is an atom
The smallest part of an element that can exist
What is a compound
Two or more elements chemically joined together
What is a mixture
Two or more elements or compounds not chemically joined together
List three processes where mixtures can be separated
Filtration, distillation and chromatography
How is the modern periodic table arranged
The elements all go up in ascending order and there are groups in the periods. - arranged in order of the atom number (proton)
- elements in the same group in the periodic table have the same number of electrons in their outer shell
How was Mendeleevs table arranged
Arranged the elements by mass number and left gaps for undiscovered elements
What is an element
It is made form one type of atom
What are group 0 elements called
The noble gases
Describe the reactivity of group 0 elements
They are interactive and do not form molecules
Where are non metals found on the periodic table
Toward the right and top of the periodic table
What are group 1 elements called
Alkali metals
What are group 7 elements called
Halogens
What are halogens
Non metals
Where are transition metals found
In the middle of the periodic table
How many different elements are there
Around 100
