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Electron. In a stable element the number of protons (+ charged subatomic particles) must match the number of electrons (- charged subatomic particles) and neutrons (neutral or uncharged subatomic particles). At least that's how I remember it from my school days.

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Q: As you move across the periodic table for left to right each element gains one proton and one?
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Related questions

What element is created when oxygen gains a proton?

Fluorine


What element is produced when a gold nucleus gains a proton?

Oxygen has 8 protons. When it gains one more, it becomes fluorine, the element with atomic number 9.


What is the difference between an atom an isotope and an ion?

an ion is when an element loses or gains one or more electrons. an isotope is when a element loses or gains one or more neutrons. when one or more proton(s) is/are gained or lost, it becomes a different element.


Why a hydrogen atom can become either an ion or a part of a molecule?

Hydrogen only has one proton ,so it can pass that one proton onto another element, making it part of a molecule. It can become an ion if it loses that proton, or gains that proton.


Which row shows the change that takes place when element X gains the new particle shown?

electron the element one place to the right of X in the Periodic Table is formed


What happenes when you combine a left hand element and a right hand element?

Presuming that you mean from the left and right of the periodic table, you are likely to get an ionic compound as the left hand (metal) element loses electrons and the right hand (non metal) element gains them.


An acid that forms when a base gains a proton?

conjugate acid


Is a conjugate acid formed when a base gains a proton?

yes


Does a weak acid gain a proton?

No, an acid, weak or strong, donates a proton. It is a base that gains one.


Does an atom change with positive charges?

When an atom gains a positive charge it either gains a proton or gains an electron It could also lose one of them


Based on their placement on the periodic table what about ion formation is correct There is more than one correct statement?

A Group 6A element gains two electrons A Group 2A element loses two electrons A Group 3A element loses three electrons A Group 3A element loses three electrons group 1a element loses one electron group 7a gains one electron


How does an ion become Negatively charge?

it loses a proton or gains an electron