Which of the following was originally a tenet of dalton's atomic theory, but had to be revised about a century ago

a. atoms are tiny indivisible particles
b. atom of different element can combine with one another in simple whole number ratios
c. compounds are made by combining atoms
d. atoms of the same element are identical

If your in Connections Academy these would be the atoms and elements unit test:

1) c.

2) a.

3) b.

4) d.

5) a.

6) c.

7) a.

8) b.

9) b.

10) d.

11) d.

12) c.

13) c.

14) c.

15) a.

16) d.

17) c.

18) c.

19) c.

20) d.

21) c.

22) d.

23) 6 protons, 6 electrons and 7 neutrons

The rest your on your own. Hope this helps ;)

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

it means there are 3 atoms of oxygen