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MDCAT · Free practice

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The ion Y2− has the electronic configuration 1s2 2s2 2p6 3s2 3p6. Where is element Y placed in the periodic table?

NUST NET · Free practice

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The tangent to y = x2 − 3x is parallel to the line y = x + 7 at the point

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O Level Biology · sample question

Transverse section of a leaf: below the upper epidermis, layer X of tall, tightly packed cells full of chloroplasts; below it, layer Y of irregular cells with large air spaces; then the lower epidermis.

A diagram of a leaf section shows layer X just below the upper epidermis, made of tall, tightly packed cells full of chloroplasts. Below it, layer Y has irregular cells with large air spaces. What are X and Y?

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Fahad Hameed AhmadChemistry

Fahad H. Ahmad

World Distinction in A Levels (2024) and Top in Pakistan in O Levels (2015), with 4× Best Across 3 A Levels awards. Chemistry lectures have reached a global audience with 10M+ views.

Ahmed Al-MansouriPhysics

Ahmed Al-Mansouri

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IB & A-Level English mentor with over a decade of experience, helping students reach A* excellence through refined writing, confident communication, and literary insight.

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