Atomic Mass of the mainly occurring isotopes) of the first 20 elements (rounded figures)
Ordering on atomic number 1 - 20
1 H
4 He
7 Li
9 Be
11 B
12 C
14 N
16 O
19 F
20 Ne
23 Na
24 Mg
27 Al
28 Si
31 P
32 S
35.5 Cl
36 Ar
39 K
40 Ca
*) But actually there are about 85 'different mass' isotopes from these 20 elements.
The Atomic number is the number of protons (positive charges) in the nucleus. So the very simple answer is Hydrogen has 1 proton, so Atomic number is 1 all the way up to Calcium, 20 protons with Atomic number 20. The significant fact here is that the atomic number defines the element.
These are the atomic mass values of the first 20 atoms, numbered 1 to 20:
This question can be answered by any Periodic Table. The atomic number is the number of protons in the nucleus of an atom of that particular element. The atomic number must be a counting number (1,2,3,4...) and the atomic number increases by increments of one from left to right across each row. The sequence is continued of the next row, for instance neon's atomic number is 10, the next row starts with sodium; atomic number 11.
Hydrogen: 0 Helium: 2 Lithium: 4 Beryllium: 5 Boron: 6 Carbon: 6 Nitrogen: 7 Oxygen: 8 Fluorine: 10 Neon: 10 Sodium: 12 Magnesium: 12 Aluminum: 14 Silicon: 14 Phosphorus: 16 Sulfur: 16 Chlorine: 18 Argon: 22 Potassium: 20 Calcium: 20
The number of neutrons in an element is not fixed. This is why "isotopes" of elements exist. Take the simplest atom, that of Hydrogen, this can have 0, 1 or 2 neutrons.
Thus you can see that your question is far to broad to elicit a simple answer.
Starting from
Hydrogen (H) atomic number 1
Helium (He) atomic number 2
Lithium (Li) atomic number 3
Beryllium (Be) atomic number 4
Boron (B) atomic number 5
Carbon (C) atomic number 6
Nitrogen (N) atomic number 7
Oxygen (O) atomic number 8
Fluorine (F) atomic number 9
Neon (Ne) atomic number 10
Sodium (Na) atomic number 11
Magnesium (Mg) atomic number 12
Aluminum (Al) atomic number 13
Silicon (Si) atomic number 14
Phosphorus (P) atomic number 15
Sulfur (S) atomic number 16
Chlorine (Cl) atomic number 17
Argon (Ar) atomic number 18
Potassium (K) atomic number 19
Calcium (Ca) atomic number 20.
Hydrogen: 1 proton
Helium: 2 protons
Lithium: 3
Beryllium: 4
Boron: 5
Carbon: 6
Nitrogen: 7
Oxygen: 8
Fluorine: 9
Neon: 10
Sodium: 11
Magnesium: 12
Aluminum: 13
Silicon: 14
Phosphorus: 15
Sulfur: 16
Chlorine: 17
Argon: 18
Potassium: 19
Calcium: 20
Mass numbers refer to the numbers of protons and neutrons in the nuclei of specific isotopes. It would be easier to ask for the atomic weights of the first 20 elements on the periodic table, because they are written along with element's symbol and atomic number. If you really want to know the mass numbers of the isotopes of the first 20 elements, I recommend looking up the Wikipedia article for each element.
give me graph paper first!!!!!!!!!!!!!!
Mass number is term used for isotopes, not for elements. And it is boring to list here all the isotopes of the first 20 elements.
We would find it easier to respond to this question if we knew what is meant by the 'top 20 elements'.
Calcium is the element that has the atomic number 20.
In chemistry, a synthetic element is a chemical element that does not occur naturally on Earth, and can only be created artificially. So far 20 synthetic elements have been synthesized (those with atomic numbers 99-118). so the answer is the element Ensteinium with atomic number 99.
give me graph paper first!!!!!!!!!!!!!!
Mass number is term used for isotopes, not for elements. And it is boring to list here all the isotopes of the first 20 elements.
Elements by definition are electrical neutral and therefore are not cations, which have a positive electrical charge. The first (i.e., those having the lowest atomic numbers) 20 elements that commonly form cations during chemical reaction are hydrogen, lithium, beryllium, sodium, magnesium, aluminum, potassium, calcium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, and arsenic.
Yes, it has the atomic # of 20 on the periodic table of elements.
Neon is a non meta element. Atomic mass of it is 20 Atomic number of it is1 180.
We would find it easier to respond to this question if we knew what is meant by the 'top 20 elements'.
The first 20 odd numbers are: 13579111315171921232527293133353739.
Calcium is the element that has the atomic number 20.
Took me a while to find but you can spot it eventually. It's Argon (Ar) and Potassium (K). Hope this helps :)
20 kilotons
The Atomic Number of an Element displays how many Protons it has in its nucleus, and so elements with higher atomic numbers tend to be heavier than those with less. Charge is how many electrons need to be removed or added in order to form a perfect octect of 8. For Example, Calcium has an atomic number of 20-this means it has 20 Protons, and, naturally, 20 Electrons. Simply by its position in the periodic table being row 2, it can be determined that Calcium must lose 2 electrons in order to look like Argon-which is an element that has Atomic Number 18(and thus 18 electrons. Argon has a perfect octect in its outer shell).
In chemistry, a synthetic element is a chemical element that does not occur naturally on Earth, and can only be created artificially. So far 20 synthetic elements have been synthesized (those with atomic numbers 99-118). so the answer is the element Ensteinium with atomic number 99.