Question

1. complete the table (table columns: element name, element symbol, atomic number, group number, family name, period number, nonmetal; rows: fluorine, barium, argon with some filled values)
2. state which of the following describes a physical property or a chemical property for each case below. t/i-8 marks

a) magnesium is hammered into a thin sheet ______
b) potassium causes an explosion on contact with water ______
c) dinner smell good ______
d) oxygen is gas at room temperature ______
e) silver is shiny and has luster ______
f) a bomb explodes ______
g) iron rusts in moist air ______
h) cookies taste good ______

Explanation:

Problem 1: Completing the Table (Assuming Correcting Errors)

To complete the table, we use knowledge of the periodic table:

• Fluorine: Element symbol is $F$, atomic number $9$, group $17$ (halogens), period $2$, non - metal. The given "67" for symbol is wrong; correct symbol is $F$.
• Barium: Element symbol $Ba$, atomic number $56$, group $2$ (alkaline earth metals), period $6$, metal. This row has correct symbol, atomic number, group, family, and metal classification.
• Argon: Element symbol $Ar$, atomic number $18$, group $18$ (noble gases), period $3$, non - metal. This row has correct symbol, atomic number, group, family, and non - metal classification.

Correct Table:

Element name	Element symbol	Atomic number	Group number	Family name	Period number	nonmetal/metal
Barium	$Ba$	$56$	$2$	Alkaline Earth metal	$6$	metal
Argon	$Ar$	$18$	$18$	noble gas	$3$	non - metal

Problem 2: Physical or Chemical Property

• a) Magnesium is hammered into a thin sheet: Malleability (a physical property) as it involves a change in shape without changing the substance's chemical identity.
• b) Potassium causes an explosion on contact with water: A chemical reaction occurs (potassium reacts with water), so it's a chemical property.
• c) Dinner smell good: Odor is a physical property (it can be observed without changing the chemical composition of the dinner).
• d) Oxygen is gas at room temperature: State of matter is a physical property (can be observed without a chemical change).
• e) Silver is shiny and has luster: Luster is a physical property (observable without altering the chemical nature of silver).
• f) A bomb explodes: A chemical reaction (combustion or other reactions) occurs, so it's a chemical property (related to the chemical changes during explosion).
• g) Iron rusts in moist air: Rusting is a chemical reaction (iron reacts with oxygen and water to form rust), so it's a chemical property.
• h) Cookies taste good: Taste is a physical property (can be perceived without changing the chemical composition of the cookies).

Answer:

s:
a) Physical property
b) Chemical property
c) Physical property
d) Physical property
e) Physical property
f) Chemical property
g) Chemical property
h) Physical property