The electron dot diagram shows the arrangement of dels without identilying the element,
Which element's symbol could replace the question mark in
the diagram?
boron (B)
O neon (Ne)
Orubidium (b)
arsenic (A)
Malk thor and notum.
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Subina
anything
O
O

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.