Tổng số hạt cơ bản của 1 nguyên tử nguyên tố X là 24. viết kí hiệu nguyên tử X

Neither model is able to show the reactivity of potassium.

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.

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