Sulfur (S) is a metal non-metal semimetal alkali metal Lithium (Li) is a metal n

Question

Sulfur (S) is a metal non-metal semimetal alkali metal Lithium (Li) is a metal non-metal semimetal alkali metal Circle the answer that best completes the sentence below. The only nonmetal that is a liquid is Hg or Br Isotopes have neutrons different number of protons or different number of neutrons The visible spectrum of light is between 380 nm middot 780 nm or 400cm middot 800 cm Halogens have a melting point and boiling point than metals. higher or lower Circle the answer that best describes each sentence below. The greater ionization energy: calcium or chlorine The greater electron affinity: calcium or chlorine The greater effective nuclear charge (Z_eff): calcium or chlorine The mass (in amu) of a single^12 C atom is amu.

Explanation / Answer

5. Sulfur (S) is a -------?

Solution-

Sulfur (S)- Sulfur is a non -metal

In periodic table sulfur comes under non-metal having atomic number =16 and denoted by “S”

Nonmetals are tend to gain or share electrons when they react with other substances and it do not conduct heat and electricity.

6. Lithium (Li) is a ----?

Solution-

Lithium (Li) – Lithium is a alkali metal.

In periodic table Lithium comes under alkali metal in S block in period 2,having atomic number = 3 and denoted by “Li”.

Alkali metal- are very similar properties they are all shiny, soft, highly reactive metals at standard temperature and pressure and lose their outermost electron to form cations with charge +1

7.

The only non- metal that is a liquid is Br.

Br is a non- metal in periodic table and liquid at room temperature.

Hg is metal and liquid at room temperature

Isotopes have different number of neutrons.

Isotopes have different number of neutron but same number of proton in each atom.

The visible spectrum of light is in between 380 nm – 780 nm

Halogens have a lower melting point and boiling point than metal.

8.

Chlorine have greater ionization energy than calcium.

Cl ionization energy 1251 kJ/mol

Ca ionization energy 590 kJ/mol

Chlorine have greater electron affinity than calcium.

Cl electron affinity = 349KJ/mol

Ca electron affinity = -10KJ/mol

Chlorine have greater effective nuclear charge (Zeff) than calcium.

9. The mass (in amu) of single 12C atom is = 12 amu.

Mass of one mole of C12 = 12 g.
so mass of 1 atom of C12 = 1.9927e-23 g.
C12 has mass of 12 amu.

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