The property of all ionic compounds that makes chalk particularly useful for writing on a chalkboard is : Hardness and Brittleness
Those properties make chalk leaves residues on the board every time friction happen between the chalk and the board
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<span>Fossil record, genetics, and examples of local adaptations all support the theory of evolution by natural selection.</span>
Answer:
One
Explanation:
Sodium (Na) has one valence electron so it gets one dot.
Some foods and eating patterns may make it easier to keep obesity in check. Healthy food choices and diet patterns that help prevent heart disease, diabetes, and other chronic conditions may also help to prevent weight gain.
Eat whole foods-whole grains, vegetables, fruits, nuts, healthful sources of protein (fish, poultry, beans), and plant oils. Processed food should be minimal. Limit sugared beverages, refined grains, potatoes, red and processed meats, and other highly processed foods, such as fast food.
