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Why is there a significant difference between the radii of first and second row transition metals, where as no difference (or even a decrease) is observed between the second and third rows?

The answer stems from the lanthanide (or lanthanoid) contraction. In more detail, there is a steady decrease in the radii of atoms from Lanthanum through to Lutetium, despite the associated increase in th...

IB
Answered by Ioannis B. Chemistry tutor
1966 Views

Why do ionisation energies have a general increase across periods?

Ionisation energy is the energy required for one mole of gaseous atoms to lose one mole of electrons, hence forming one mole of gaseous ions.The ionisation energies for elements increases across the perio...

AP
Answered by Anna P. Chemistry tutor
2216 Views

Why is the nos form of 'jugar', spelt 'jugamos' and not 'juegamos'

The nos form of 'jugar' is spelt 'jugamos' and not 'juegamos' because it is a radical changing verb. This means that the stem of the verb does not stay the same as it would with regular verbs, such as com...

HB
Answered by Hannah B. Spanish tutor
4753 Views

A compound is found to contain 3.1% Hydrogen, 65.3% Oxygen and 31.6% Phosphorus. Work out its empirical formula.

To answer this question, we need to know the relative number of atoms of each element present. This can be calculated by dividing the amount of an element present in the sample by the relative masses of t...

AB
Answered by Adam B. Chemistry tutor
5275 Views

What does the 吧 in Chinese signify?

Unfortunately, there is no real translation for the 吧 in Mandarin. It is used at the end of the sentence to emphasize exclamation. It can be used after a verb to express an order. It is usually used verba...

DB
Answered by Dinh B. Mandarin tutor
2442 Views

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