General Knowledge #2 Flashcards
1
Q
In 1850, what did Robert Bunsen discover?
A
when different elements are heated, they produce bands of light with colours unique to that element
2
Q
Who partly developed the periodic table?
A
Russian chemist, Dmitri Mendeleev, in 1869.
3
Q
How are elements organised on the periodic table?
A
increasing atomic number
4
Q
atoms have a positively charged central nucleus that contains protons and neutrons.
A
true
5
Q
where are electrons found?
A
in orbitals (or shells) around the outside of the nucleus
6
Q
what are orbitals?
A
different orbitals are represented as circles at different distances from the nucleus
orbitals have different levels of energy. The closer to the nucleus, the less energy an orbital has.
7
Q
the third electron shell can hold up to 8 or 18 electrons?
A
true
