Tổng số hạt của nguyên X 60. Số hạt mang điện gấp đôi số không mang điện . Tinh nguyên nguyên tử X Viết cấu hình e của X ? X thuộc loại nguyên tố , vì sao ? X có tính chất cơ bản gì ?

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

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