Table of Contents
What element contains 18 neutrons?
Atoms and isotopes 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. The different types of chlorine are called isotopes of chlorine.
What element has a number of 18?
argon
| atomic number | 18 |
|---|---|
| atomic weight | [39.792, 39.963] |
| melting point | −189.2 °C (−308.6 °F) |
| boiling point | −185.7 °C (−302.3 °F) |
| density (1 atm, 0° C) | 1.784 g/litre |
How many neutrons are in a nucleus of oxygen-18?
10 neutrons
“Light” oxygen-16, with 8 protons and 8 neutrons, is the most common isotope found in nature, followed by much lesser amounts of “heavy” oxygen-18, with 8 protons and 10 neutrons.
How many electrons does oxygen-18 have?
8 electrons
A neutral atom of oxygen-18 will have 8 electrons. The way to determine this is to look at the atomic number of oxygen, which is 8.
What element has 18 protons and 21 neutrons?
Cards
| Term Hydrogen | Definition H #1 1 proton, 0 neutrons, 1 electron atomic mass= 1 charge= +1 |
|---|---|
| Term Chlorine | Definition Cl #17 17 protons, 18 neutrons, 17 electrons atomic mass= 35 charge= -1 |
| Term Argon | Definition Ar #18 18 protons, 21 neutrons, 18 eletrons atomic mass= 39 |
How many protons neutrons and electrons are in an 18 o?
18O2− has 8 protons, 10 neutrons, and 10 electrons.
What element has 19 protons and 20 neutrons?
Potassium is an ion with a mass number of 39, 19 protons, 20 neutrons, 18 electrons, and a charge of +1. What is the atomic number? 79 Gold is an ion with a mass number of 197, 79 protons, 118 neutrons, 78 electrons, and a +1 charge.
What ion has 17 protons and 18 electrons?
A chlorine ion has 17 protons and 18 electrons. Is it a cation or an anion? Se-2 A selenium ion has 34 protons, 36 electrons, and 45 neutrons.
Which element has an atomic number of 18?
Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv).
What element has protons?
A hydrogen atom is made of one proton and one electron. Because hydrogen has one proton, it has an atomic number of one. It is the only element whose atoms don’t have any neutrons. Helium has an atomic number of two; helium has two protons, two neutrons, and two electrons.