Atomic Structure + Periodic Table Flashcards
1
Q
What is the relative charge and mass of a proton?
A
Charge = +1, Mass = 1
2
Q
How did Mendeleev arrange the periodic table?
A
By atomic mass, leaving gaps for undiscovered elements
3
Q
What is an isotope?
A
Atoms of the same element with the same number of protons but different numbers of neutrons
4
Q
Why do noble gases (Group 0) have low reactivity?
A
They have a full outer shell of electrons
5
Q
What happens to reactivity down Group 1 (alkali metals)?
A
Reactivity increases because the outer electron is further from the nucleus and more easily lost
