Grass as it is the only one not made of metal.
Odd + even = odd
odd
One is an odd number
The sum of one odd number and one even number is another odd number.
Iron is the odd one out because it is a metal, while oxygen, carbon, and sulfur are nonmetals.
Lithium is the odd one out because it is a metal, while nitrogen, oxygen, and carbon are nonmetals.
Grass as it is the only one not made of metal.
Carbon is the odd one out because it is a non-metal, while copper, aluminum, and iron are metals.
Iron is the odd one out because it is a transition metal, while lithium, potassium, and sodium are alkali metals.
Carbon is the odd one out, because that's the only element in this row
Iron is the odd one out because it is a transition metal, while lithium, sodium, and potassium are alkali metals.
Sulfur is the odd one out as it is a non-metal, while the others (gold, aluminum, silver, lead) are metals.
Glass is the odd one out because it is not a metal, unlike steel, iron, and tin.
Odd + even = odd
odd
One is an odd number