Compare size of lithium (atomic number=3) and boron ( atomic number=5) which one is larger and which one is smaller

Md Ariful Islam

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Lithium is larger, boron is smaller. Because increasing atomic number means increasing positive nuclear charge, which attract the external electrons stronger. Since the electrons have the same mean quantum number (n = 2), the orbitals size decrease.

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The nucleon number and proton number of the lithium atom are shown by the symbol above. Write the electronic configuration of lithium atom.

[He] 2s1

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The compound lithium carbonate, used to treat manic depression, has the formula of Li2CO3. Calculate the number of formula units of lithium carbonate present in a 0.500g sample of lithium carbonate.

Molar mass of Li2CO3 = 73.891 g/mol0.5/73.891= 0.0068moles

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Hi What are the products of the following reaction when a voltage is applied: Boron + lithium+ nitrogen + carbon + h20(water-gas)->? Thanks

Solution: 2B+2Li+N2+C+H2O(water-gas)=2LiH+2BN+CO.

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The atomic mass of two stable isotopes of boron, 10 5B (19.78%) and 11 5B (80.22%) are 10.0129 amu and 11.0093 amu respectively. Calculate the average atomic mass of boron.

Average atomic mass=(19.78%*10.0129amu + 80.22%*11.0093amu)/100%=10.8122amu

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Lithium atom has two naturally occuring isotopes 26Li and 27Li. Given that the relative molecular mass of Lithium is 6.94. What is the abundance of these isotopes?

average atomic mass = (26 + 27)/2= 26.526.5% = x + (1-x)26.5 × 3.47 = 91.95591.955 = 2xX = 45.978

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boron occurs in nature in the form of two isotopes having atomic mass 10 and 11. what are the precentage abundances of two isotopes in a sample of boron haqving atomic mass 10.8

Hence the %abundance of the two isotopes are 20 80 %.

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Natural boron is composed of two isotopes: 19.78% boron-10 (atomic mass = 10.0129 amu) and 80.22% boron-11 (atomic mass = 11.0093 amu). What is the average atomic mass of naturally occurring boron?

Average atomic mass=(19.78%*10.0129amu + 80.22%*11.0093amu)/100%=10.8122amu

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Turn Aqueous lithium phosphate reacts with aqueous iron(III) nitrate to form aqueous lithium nitrate and solid iron(III) phosphate into a balanced equation

Solution: Li3PO4 + Fe(NO3)3 = 3LiNO3 + FePO4

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Boron is composed of two isotopes, 10B (10.013 u) and 11B (11.009 u). If the average atomic mass of Boron is 10.81 u, calculate the percentage abundance of 10B and 11B.

At first we may designate percentage as parts of 1: B10 content as x and B11 content as y. If there are only two isotopes, so their sum will be...

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When Lithium atom with one valence electron reacts with sulfur which has six valence electrons, what would be the charge of Lithium and sulfur after the reaction?

Li+S=Li2S. Li+ , S2-

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