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ANTONII [103]
3 years ago
6

What is the mass of strontiums isotopes

Chemistry
1 answer:
Elanso [62]3 years ago
7 0

Strontium has four stable, naturally occurring isotopes: 84-Sr (0.56%), 86-Sr (9.86%), 87-Sr (7.0%) and 88-Sr (82.58%). 87.62 is standard atomic mass of strontium.

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Na+ means a sodium atom that has lost one valence electron. A Sodium atom  initially has 11 electrons, but having lost an electron making it 10 electrons remaining with electron configuration of 1s2 2s2 2p6.

O2- means oxygen atom that has gained two valence electrons. An oxygen atom  initially has 8 electrons, having gained two electrons makes it 10 electrons with electron configuration of 1s2 2s2 2p6. same as Na+

The purpose of gaining or losing electrons is to attain a stable duplet or octet structure.

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