Condensation releases water
Answer:
There is a physical change as the water is evaporating, producing a gas.
Answer:
Central-metal oxidation state: +2
Coordination number: 6
Overall charge: -2
Explanation:
In the ion complex:
Na₂[Cr(NH₃)₂(NCS)₄]
The central-metal is Cr, the ligands are NH₃ and NCS.
The NH₃ is a neutral ligand, while NCS is an anionic ligand with -1 in charge.
The overall charge of the complex is:
2Na⁺ + [Cr(NH₃)₂(NCS)₄]⁻² → <em>-2</em>
As NCS gives -1 in charge and there are four NCS, The Cr must be in <em>+2</em> of oxidation state to give an overall charge of -2.
As Cr is bonded to 2 NH₃ and 4 NCS, the coordination number is 2+4 = <em>6</em>
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I hope it helps!
The uranium within these items is radioactive and should be treated with care. Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays into thorium-234 through alpha decay or decays through spontaneous fission.
Answer:
(b) lose electrons and form positive ions
Explanation:
<u>Ionic bonding:-
</u>
This type of bonding is formed when there is a complete transfer of electrons from one element to another element. In this bonding one element is always a metal and another is a non-metal.
<u>For example, the formation of NaCl</u>
The electronic configuration of sodium with Z = 11 is : 2, 8, 1
The electronic configuration of chlorine with Z = 17 is : 2, 8, 7
<u>Thus, sodium loses one electron and become positively charged and chlorine accepts this electron and become negatively charged and they have both their octets complete and form ionic bond.</u>
Hence, can be seen from the above example, metallic atoms generally lose electrons and form positive ions.
