Which elementwould be most reactive with potassium?Calcium,Gallium,Bromine,Krypton Which would be most reactive with Oxygen?Calcium,Sodium,Copper,NeonStudying For Finals.

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lynn30k's profile pic

lynn30k | High School Teacher | (Level 1) Educator

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Elements react with others in such a way to have 8 electrons in their valence shell (the outermost energy level.) Sometimes they form ionic bonds, in which electrone move from one atom to the other; the atoms are then held together by the difference in their charges. In other compounds, electrons are shared, so that both atoms end up with 8 in their outer shells.

In your examples, potassium has one valence electron, and would therefore react with an atom that has 7--again, that magic number of 8 is key. Which one of your listed elements has 7? Bromine. (Krypton is a noble gas; it already has 8, and is very, very NON-reactive.)

Your second question is about oxygen, which has 6 valence electrons, so we are looking for the element with 2--calcium.

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atyourservice | Student, Grade 11 | (Level 3) Valedictorian

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potassium will be most reactive with bromine, because all atoms try to gain the pseudo configuration of a noble gas, potassium is trying to get rid of that one electron keeping it away from having a noble gas configuration and bromine is trying to gain 1 more electron to reach 8

Oxygen will be most reactive with calcium, because oxygen is trying to gain 2 electrons while calcium is trying to lose 2

ilove9thgradechicks's profile pic

ilove9thgradechicks | Student, Grade 9 | (Level 2) Honors

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it all has to do with valance electrons

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