Elements on the periodic table Flashcards
1
Q
What is atomic number?
A
The number of protons in the element.
2
Q
What is atomic mass?
A
The sum of the protons and neutrons in the element.
3
Q
What was Mendeleev’s periodic table organized by?
A
Based on
atomic mass as well as chemical and physical properties. His periodic table made it possible to predict properties of elements that had not yet been discovered.
4
Q
What is the modern periodic table organized by?
A
Arranges the elements by increasing atomic number instead of atomic mass.
5
Q
What is an isotope?
A
Atoms of the same element that have the same number of protons but a different number of neutrons.
