Circle is a shape, while the others are colors.

The Renaissance is a cultural movement, while the other three options are significant historical events related to wars and economic crises.

Sunflower is a plant, while the others are planets.

'Quantum Mechanics' is a branch of physics, while the other three are significant historical events.

'Ecosystem' refers to a biological community, while the others are technological concepts.

Sunflower is a plant, while the others are planets.

All options are perfect squares except 1 which is not a square of a whole number.

Betrayal is the opposite of friendship, while the others are positive attributes of friendship.

Both Bacteria and Archaea are domains that include primarily unicellular and prokaryotic organisms.

Both Bacteria and Archaea are domains that include prokaryotic organisms, which lack a nucleus.

Tropical rainforests have the highest biodiversity among ecosystems due to their warm climate and abundant rainfall.

Tropical rainforests are known for their high biodiversity due to favorable climatic conditions.

Tropical rainforests are known for having the highest biodiversity among ecosystems.

Neodymium (Nd) is a lanthanide element, while the others belong to different series.

Sodium (Na) can act as a reducing agent as it can donate electrons.

All of the listed elements can form coordinate bonds by donating a lone pair of electrons.

Tin can form a stable +4 oxidation state.

Nitrogen can form a triple bond, as seen in N2, where three pairs of electrons are shared between the two nitrogen atoms.

Carbon can form multiple bonds (double and triple bonds) due to its ability to hybridize and share electrons.

Lead does not form a stable +4 oxidation state; it is more stable in the +2 state.

Lead does not form a stable oxide in the same way as the other elements listed.

Nitrogen has the electronic configuration 1s2 2s2 2p3, which means it has a half-filled p subshell.

Chromium (Cr) has an electronic configuration of [Ar] 4s1 3d5, which means it has an incomplete d subshell.

The electron configuration [Ne]3s²3p⁵ corresponds to Chlorine, which has 17 electrons.

Calcium (Ca) has an atomic number of 20, and its electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2.

Bromine (Br) has the electronic configuration ending in 4p5, corresponding to atomic number 35.

The element with the configuration [Kr] 5s2 4d10 5p5 is Astatine (At), which has atomic number 85.

Strontium (Sr) has 38 electrons, and its electronic configuration is [Kr] 5s2.

The electronic configuration [Ne] 3s2 3p1 corresponds to Aluminum.

Magnesium (Mg) has 12 electrons, and its electronic configuration is [Ne] 3s2.