Answer:
About 60.
Explanation:
Mendeleev knew of 63 elements. He wrote their properties on cards and arranged them in order of atomic mass.
That's how he discovered that the properties of elements are periodic functions of their atomic masses.
Answer:
I believe it is 3 and 4. I really hope it is but i am positive :)
The correct answer is 1.1 moles
Hot liquid rock comes in contact with Earth´s cold crust
A persons weight changes as he travels from earth to space but his mass remains the same
