The answer is C.
Scandium has 24 neutrons, not 21.
Scandium is a metal that is silvery in color. When exposed to air, it tends to tarnish. It burns quite easily and will react with water. Scandium was discovered by Lars Fredrik Nilson in the year 1879 in the country of Sweden and its name is from the Latin word Scandia, meaning Scandinavian.
Other properties of Scandium include:
Melting point: 1539.0 °C
Boiling point: 2832.0 °C
Density: 2.989 grams/cm³
Normal phase: Solid
Family: Transition metals
Period: 4
Answer:
Legend has it that Mendeleev conceived and created his table in a single day: February 17, 1869, on the Russian calendar (March 1 in most of the rest of the world).READ THE EXPLANATION
Explanation:
La leyenda dice que Mendeleev concibió y creó su mesa en un solo día: 17 de febrero de 1869, en el calendario ruso (1 de marzo en la mayoría del resto del mundo).
A.) To change Temperature......
<span>K2S(aq) + 2 HBr(aq) = 2 KBr + H2S(g)
potassium sulfide + hydrobromic acid = potassium bromide + hydrogen sulfide
The gas is H2S, hydrogen sulfide
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Answer:
atom, ions, protons neutrons, atomic number
Explanation:
