4: Atoms: the building blocks of matter Flashcards
master
1
Q
What is an element
A
is any substance that cannot be broken down into a simpler substance by a chemical reaction.
2
Q
What is an atom
A
it is the smallest particle of an element that still retains the chemical properties of that element.
3
Q
Why doesn’t mass number appear on the periodic table
A
- Because for any element, there’s no such thing as one mass number. Different isotopes of the same element have different mass numbers.
4
Q
What is an atomic weight
A
- It is the average mass number of all isotopes of an element as they appear on earth. It appears on the periodic table below the element’s symbol. It can be used as the mass of the atom.
5
Q
Why does fluorine has an ox no of -1 in all compounds
A
Bcs it is the most electronegative element
