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The number of valence electrons for the elements increases across a period, from 1 (group 1) to 8 (group 18).

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Green Tremblay

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How does the number of valence electrons change as you go across the 2nd period of the periodic table?

the no. of electrons increses


What happens to valence electrons as you move across the row?

The number of valence electrons remains the same as you move across a row on the periodic table. For example, in row 2 (elements from Li to Ne), all elements have 2 valence electrons. However, the chemical reactivity of these valence electrons can change as you move across the row due to the increasing nuclear charge affecting their interactions with other atoms.


How does the numbers of electrons change across a period of elements?

The number of valence electrons for the elements increases across a period, from 1 (group 1) to 8 (group 18).


Why do element properties change in a regular way across a period?

As atomic number increases, the number of electrons also increases except for Period 1 because it ends with a number of valence electrons with higher energy , (This pattern means that the elements within a group always have the same number of valence electrons having the result of having similar properties.)


Why do properties of element change in Regular way across a period?

As atomic number increases, the number of electrons also increases except for Period 1 because it ends with a number of valence electrons with higher energy , (This pattern means that the elements within a group always have the same number of valence electrons having the result of having similar properties.)


What is the most common change in the element Calcium?

The most common change in an atom of the element calcium is the loss of the two electrons in the valence shell of atom,resulting ina calcium cation.


Do element properties change as you move across a period or whithin a group?

Yes, element properties change as you move across a period due to the increasing number of protons in the nucleus and the change in electron configuration. Within a group, elements have similar properties because they have the same number of valence electrons, which determine their reactivity.


What change in electron structure occur when Mg atom become a Mg ion?

Magnesium is a group 2A element, and has 2 valence electrons. Thus, for it to become an ion (Mg^2+) is loses those 2 valence electrons.


What is important about the valence electrons?

When an atom undergoes chemical change, only the outermost (valence electrons) are involved.


What subatomic particle gives you the atomic number?

Protons.The atomic number of an atom is the number of protons in the atom. The identity of an atom is based on its atomic number, so a change in the number of protons mean an atom has turned into a different element. However, an addition or subtraction of neutrons creates different isotopes of an element, and a change in the number of electrons creates an ion of the element.


How is that an element can have many forms if the protons never change?

Different number of neutrons result in different isotopes:Hydrogen - 1 proton, no neutronsDeuterium - 1 proton, 1 neutronTritium - 1 proton, 2 neutrons (radioactive)Different oxidation states by exchanging electrons between higher energy "hidden" orbitals and valence orbitals:Ferrous - Iron with 2 electrons in valence orbitalsFerric - Iron with 3 electrons in valence orbitals


What major change occurs as you move left to right on the periodic table?

As you move left to right on the periodic table, the number of valence electrons an element has increases. The number of valence electrons an element has corresponds to which group (column) an element is. (This rule does not apply to transition metals...)