A: calcium
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An atom of which element has the same electronic configuration as the strontium ion?
A radioactive isotope of carbon has more nucleons than the non-radioactive isotope, ¹²C. How many protons, neutrons a…
Which electronic configurations represent three metallic elements in the same period of the Periodic Table?
Which statement most clearly indicates that diamond and graphite are forms of carbon?
In an experiment, 1 cm³ of a gaseous hydrocarbon X required 4cm³ of oxygen for complete combustion to give 3 cm³ of c…
What is the concentration of a solution containing 1.0g of sodium hydroxide in 250 cm³ of solution?