Periodic Table Part 5 Flashcards
When did Niels Bohr develop the Bohr model?
1913
What are the colours of the four lines of the emission spectrum of hydrogen?
Violet, blue, green and red
How did emission spectra act as evidence for electron shells in the Bohr model?
It assumes that only electrons can exist in fixed, circular orbits of specific energies and therefore they can emit energy in the form of light
What happens when an electron moves from a higher energy shell to a lower energy shell?
It emits energy in the form of light
What happens when an atom gains one or more electrons?
It forms an anion, a negatively charged ion
What happens when an atom loses one or more electrons?
It forms a cation, a positively charged ion
Which of Dalton’s predictions was later proven to be incorrect?
Atoms are indivisible and indestructible
Why are elements in the periodic table arranged in order of atomic number rather than relative atomic mass?
Atomic number is what makes one element fundamentally different from another element
What is electronegativity?
The ability of an element to attract electrons towards itself
What is the core charge of an atom?
A measure of the attractive force felt by the valence electrons towards the nucleus, expressed as a positive net nuclear charge
What is the relationship between electronegativity and core charge?
The greater the core charge, the greater the electronegativity
What is the electronic configuration of chromium (Cr)?
1s2 2s2 2p6 3s2 3p6 3d5 4s1
What is the electronic configuration of copper (Cu)?
1s2 2s2 2p6 3s2 3p6 3d10 4s1
Why are chromium and copper irregular?
The d block elements are most stable if the d sub shell is either completely full (d10) or half full (d5)
What is the electronic configuration of neon in its excited state?
1s2 2s2 2p5 3s1
