where the atomic weight of the middle element was nearly the same as the average of the atomic weights of the other two elements – he called his theory 'The Law of Triads'. In 1843, Leopold Gmelin ...

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TULELA: Thanks, NNICK. SUNAYANA: So let’s just summarise Mendeleev’s table. He arranged elements in order of increasing atomic weight. The horizontal rows are called periods. The vertical ...

In this periodic table of elements quiz, you have 10 minutes to name as many elements as you can, given only their symbol, ...

Atomic number 6, atomic weight 12.01115. Manganese (Mn): Manganese is a brittle, metallic element that exists in the ore of pyrolusite. When making steel, it reacts with sulfur and helps to ...

The International Atomic Energy Agency (IAEA) defines uranium as a Low Specific Activity material. In its natural state, it consists of three isotopes (U-234, U-235 and U-238). Other isotopes that ...

Aluminum is a metal in group IIIA of the periodic table with atomic number 13, an atomic weight of 26.982, and a density of 2.70. It has a melting temperature of 660 C. The electronic configuration of ...

Silicon is a semiconductor in group IVA of the periodic table with atomic number 14, an atomic weight of 28.086, and a density of 2.33 Mg/m 3. It melts at 1410 C. The electronic configuration of the ...