This atoms charge would be +2. Electrons are negative, protons are positive, when they are in equal amounts they balance out to zero, when you lose electrons you have more protons, so the atom becomes positively charged.
Calcium-40 with a 2+ charge has lost two electrons, making it a Ca2+ ion. This ion contains 20 protons, as in all calcium atoms, and 18 electrons (since it lost two electrons).
Isopropyl alcohol, or isopropanol (C3H8O), has a total of 20 valence electrons. The carbon atoms contribute 12 valence electrons (3 carbon atoms with 4 electrons each), the hydrogen atoms contribute 8 valence electrons (8 hydrogen atoms with 1 electron each), and the oxygen atom contributes 6 valence electrons. Thus, when you sum them up (12 + 8 + 6), you get a total of 20 valence electrons.
O₂ refers to a molecule of oxygen, which consists of two oxygen atoms. Each oxygen atom has 8 electrons, so in total, O₂ has 16 electrons. If you are asking about the number of electrons in an ion of oxygen, such as O²⁻ (which has gained two extra electrons), then it would have 10 electrons per atom, totaling 20 electrons for the O²⁻ ion.
The metallic element whose atoms contain 20 electrons each is calcium, with atomic number 20. (The number of electrons in a neutral atom always matches the number of protons, which is the definition of atomic number.)
This atoms charge would be +2. Electrons are negative, protons are positive, when they are in equal amounts they balance out to zero, when you lose electrons you have more protons, so the atom becomes positively charged.
The calcium ion has 18 electrons. The sulfate ion has 16 electrons from sulfur, 32 electrons from oxygen atoms and two from the charge. Altogether, a (molecule) of calcium sulfate has 68 electrons. * Calcium sulfate is not existing as molecules, 'formula unit' is a better phrase.
Calcium-40 with a 2+ charge has lost two electrons, making it a Ca2+ ion. This ion contains 20 protons, as in all calcium atoms, and 18 electrons (since it lost two electrons).
Calcium atoms have 20 protons and 20 electrons. The number of neutrons varies with the isotope.
There are 20 protons in a calcium atom. You can find the number of atoms in any element by looking at the atomic number which is in the top right corner of the element's box on the periodic table. e.g. Ca 20 40.078
O₂ refers to a molecule of oxygen, which consists of two oxygen atoms. Each oxygen atom has 8 electrons, so in total, O₂ has 16 electrons. If you are asking about the number of electrons in an ion of oxygen, such as O²⁻ (which has gained two extra electrons), then it would have 10 electrons per atom, totaling 20 electrons for the O²⁻ ion.
The metallic element whose atoms contain 20 electrons each is calcium, with atomic number 20. (The number of electrons in a neutral atom always matches the number of protons, which is the definition of atomic number.)
That particular atom will have a positive two (+2) charge. Charged atoms are more commonly known as ions.
A neutral calcium atom that loses two electrons has a +2 charge.
2 because it has two outer shell electrons out of 8 (relevant rule only for the first 20 elements)
Atoms of calcium have 20 protons and electrons, while atoms of sodium have 11 protons and electrons. Calcium is larger in size and has a higher atomic mass compared to sodium. Both atoms are metals and are part of the alkali earth and alkali metal groups, respectively.
The same number as in an atom of Ca, the same as the atomic number of Ca. An ion will have a different number of electrons than protons, so it is not 20. Only neutral atoms have the same number of electrons as protons, which is the same as the atomic number. A calcium ion (Ca+2) has two less electrons than protons (having lost two to fulfill the octet rule), so it has 18 electrons.