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Here at Afuelscience.com we use this method...the number of valence electrons is the number of s and p electrons in the outermost shell (highest n). The number of valence electrons can also be determined by counting across the period, skipping the transition metals, until the element is reached. It is also the group number. If there is more than one atom, the number of valence electrons is the sum of all the atoms in the molecule or polyatomic ion. For ions, add the value of a negative charge and subtract the value of a positive charge. >> Example 1 How many valence electrons are in the following? # N # H2S # CO32- # NH4+ Solution: # Nitrogen is in group 5A. It has five valence electrons. # Hydrogen has one valence electron, and sulfur has six. The total for the molecule is 2(1) + 6 = 8. # Carbon has four valence electrons; oxygen has six; then two for the charge. 4 + 3(6) + 2 = 24. # Nitrogen has five valence electrons; hydrogen has one, minus one for the charge. 5 + 4(1) - 1 = 8.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoI think you mean "what elements have two electrons in the valence shell". The elements that are thought to have two valence electrons are the elements in the second column of the periodic table, (e.g. Mg - magnesium, Ca - calcium, etc.). He - helium is also known to have two valence electrons.
Wiki User
∙ 11y agoAdd your answer:
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How many protons and valence electons are in phosphorous?
6
Which element have two valence electrons?
Magnesium
What is the valence of selenium if has six valence electrons?
Two- Since it has six valence electrons, it can form two covalent bonds, making the valence two. If it is easier to think about it this way, eight valence electrons would stabilize the element. Eight minus six is two, giving us the same answer as before.
How many valence electrons should an element to react with a element with 7 valence electrons?
one valence electron
How can an element have fractional valencies or two integral valence states at a time?
atsgdxs
How many valence electons does francium have?
Francium has one valence electron.
How many valence electons are in lead?
4
What type of electons are available for bonding?
valence electrons
How many valence electons does hydrogen have?
One(1)
How many protons and valence electons are in phosphorous?
6
What is an covalent bond?
a type of strong chemical in which two atoms share one or more pairs of valence electons
Element 3 lithium has one valence electron and element 4 beryllium has two valence electrons Element 5 boron has how many valence electrons?
Boron has 3 valence electrons.Boron has 3 valence electrons.
What are electons that are found at the atom's highest or outer level called?
Valence electrons. They exist in the atom's valence shell.
What name is given to an outer shell containing eight electrons?
Valence electons
A bond form when two atoms share one or more pairs of electrons?
That type of bond is called "covalent" since they share the electons in their valence shells.
A metal containing 3 valence electrons and 13 protons in its atom is what metal?
The fact that the element has 13 protons indicates that this element is aluminum. The number of protons in the nucleus is the atomic number of an element. Every element has its own unique atomic number that never changes in ordinary chemical or physical reactions.
Which element have two valence electrons?
Magnesium
