Lithium , for example has three protons and four neutrons, leaving it with a mass number of 7.
Therefore, the mass number of an atom with 3 protons, 4 neutrons, and 3 electrons is 7 .
| Name | Lithium | Protons | 3 | Neutrons | 4 | Electrons | 3 | Atomic Number (Z) | 3 |
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Helium is the second element of the periodic table and thus is an atom with two protons in the nucleus. Most Helium atoms have two neutrons in addition to the protons. In its neutral state, Helium has two electrons in orbit about the nucleus. Model of a helium atom’s nucleus with two protons and two neutrons.
| Name Argon | Atomic Mass 39.948 atomic mass units | Number of Protons 18 | Number of Neutrons 22 | Number of Electrons 18 |
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Uranium , for example, has the largest naturally occurring nucleus with 92 protons and over 140 neutrons. where, A is the mass number of the element’s nuclei, and Z is the atomic number (X stands for the element symbol, for example: H is for hydrogen, O is for oxygen, Na for sodium, etc.)
| Oganesson | Electrons per shell 2, 8, 18, 32, 32, 18, 8 (predicted) | Physical properties | Phase at STP solid (predicted) |
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Answer: Electrons aren’t made of quarks, but have a charge of -1. Knowing this, the total charge of protons is (4*1) = +4, the total charge of neutrons is (5 * 0) = 0, and the total charge of electrons is (3*-1) = -3 .
| ATOMIC NUMBER ELEMENT ATOMIC MASS | 1 Hydrogen 1.008 | 2 Helium 4.0026 | 3 Lithium 6.94 | 4 Beryllium 9.0122 |
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Beryllium has an atomic number of 4 and an atomic mass of 9. Each atom consists of neutrons, protons and electrons. ... Here, the atomic number is 4, thus beryllium contains 4 electrons and 4 protons. Since, the atomic mass is 9, the number of neutrons is equal to 5 (= 9 – 4).
#13 – Aluminum – Al .
An element with 17 protons will always be chlorine . However an element’s mass numbers can vary, which means that it can have different numbers of neutrons. So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also have a mass number of 37, which means it has 20 neutrons.
Since, a neutral atom of argon also has 22 Neutrons.
| Atomic Number Symbol Name | 16 S Sulfur | 17 Cl Chlorine | 18 Ar Argon | 19 K Potassium |
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| Name Zirconium | Atomic Number 40 | Atomic Mass 91.224 atomic mass units | Number of Protons 40 | Number of Neutrons 51 |
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| Element | Iron | Symbol | Fe | Number of Neutrons (most stable isotope) | 30 | Atomic Mass (most stable isotope) | 56 | Type of Element | transition metal |
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