Atomic Mass

So what is the concept of average atomic weight all about?

The test tubes represent atoms of a new element “Testubium” whose symbol is Tt. You need to determine the percent of each of the naturally occurring isotopes of Testubium as well as the atomic mass of each isotope

Step 2: Date Table

Atom	Mass	Atom	Mass	Atom	Mass	Atom	Mass	Atom	Mass
1	12	21	12	41	18	61	18	81	12
2	12	22	18	42	18	62	18	82	18
3	18	23	12	43	12	63	18	83	12
4	12	24	12	44	12	64	18	84	18
5	12	25	12	45	18	65	18	85	12
6	18	26	18	46	12	66	12	86	18
7	18	27	12	47	18	67	12	87	12
8	12	28	12	48	12	68	12	88	18
9	12	29	12	49	18	69	18	89	12
10	12	30	18	50	12	70	12	90	18
11	18	31	18	51	12	71	18	91	12
12	18	32	18	52	12	72	18	92	12
13	12	33	12	53	18	73	18	93	12
14	12	34	12	54	18	74	12	94	12
15	12	35	12	55	12	75	12	95	18
16	12	36	18	56	12	76	12	96	12
17	12	37	18	57	18	77	18	97	18
18	18	38	12	58	12	78	18	98	12
19	12	39	12	59	12	79	12	99	12
20	18	40	12	60	12	80	12	100	12

Step 3: Complete the following table:

	Isotope 1	Isotope 2
Mass of isotope	g	g
Number of Atoms with this mass
Percentage of atoms with this mass