10 most difficult chemical elements riddlesChemical elements quiz
how many groups and periods does the modern periodic table have
6 periods and 14 groups
7 periods and 18 groups
8 periods and 19 groups
9 periods and 20 groups
The modern periodic table of the elements contains 18 groups, or vertical columns. Elements in a group have similar chemical and physical properties because they have the same number of outer electrons. The periodic table consists of seven periods. The periods vary in length.
What is the name of the most radioactive isotope on the planet?
210Po is extremely toxic, with one microgram being enough to kill the average adult (250,000 times more toxic than hydrogen cyanide by weight). 210Po was used to kill Russian dissident and ex-FSB officer Alexander V. Litvinenko in 2006.
What gave the name to the indium chemical element?
country of India
city of Indianapolis
its chemical indifference
In 1863, the German chemists Ferdinand Reich and Hieronymous Theodor Richter found a blue line in the spectrum of tested minerals. As no element was known with a bright blue emission, they concluded a new element was present, and they named it from the indigo color in its spectrum.
Which letter is not used as a symbol of a chemical element?
U is the chemical symbol of uranium, V - vanadium, W - tungsten.
The rarest chemical element naturally ocurring in the Earth's crust is...
Astatine is a radioactive chemical element with symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. The total amount of astatine in the Earth's crust is estimated to be less than one gram at any given time.
Which naturally occurring chemical element is the densest?
The density of osmium is 22,570 kg/m3, slightly more than Iridium (22,420) and platinum (21,450). Commonly used metals are considerably less dense - the density of iron is 7,870, lead 11,340 and mercury 13,456.
Which chemical element forms compounds which are typically intensely colored?
The name of chromium means colour in Greek. Its compounds are used as pigments, including chrome yellow which had been used to paint school buses and chromium oxides used as a green color in glassmaking. Natural rubies are colored red due to chromium ions.