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Datia tikes about different fhings
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سُئل
مايو 11
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مجهول
Datia tikes about different fhings
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مرحبًا بك إلى يزيد، حيث يمكنك طرح الأسئلة وانتظار الإجابة عليها من المستخدمين الآخرين.
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Q15: Which statement about an atom of fluorine, ¹⁹F9, is correct? A It contains more protons than neutrons. B It contains a total of 28 protons, neutrons and electrons. C Its isotopes contain different numbers of protons. D Its nucleus contains 9 neutrons.
سُئل
يوليو 9
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مجهول
0
تصويتات
1
إجابة
Q15: Which statement about an atom of fluorine, 1F, is correct? A It contains more protons than neutrons. B It contains a total of 28 protons, neutrons and electrons. C Its isotopes contain different numbers of protons. D Its nucleus contains 9 neutrons.
سُئل
يوليو 9
بواسطة
مجهول
0
تصويتات
1
إجابة
Q15: Which statement about an atom of fluorine, 1F, is correct? A It contains more protons than neutrons. B It contains a total of 28 protons, neutrons and electrons. C Its isotopes contain different numbers of protons. D Its nucleus contains 9 neutrons.
سُئل
يوليو 9
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مجهول
0
تصويتات
1
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4 different types of PVC material and some information about each type such as its application
سُئل
أغسطس 8
بواسطة
مجهول
0
تصويتات
1
إجابة
questions Since many people today like to have clean, bright white teeth, it is surprising that toothbrushes only became common in the twentieth century. But just because people haven’t been using toothbrushes doesn’t mean that they haven’t always tried to keep their teeth clean and their breath fresh. People have cleaned their teeth in a variety of different ways for thousands of years. For example, they used a device called a chewstick. This was a small, thin stick, about the size of a pencil that people chewed on, to remove food and debris from their teeth. Chewsticks were made from special trees that smelled and tasted good so that they would also freshen the mouth and breath. Some form of chewstick was used all over the world for thousands of years. Another way that people cleaned the
سُئل
مايو 29
بواسطة
مجهول
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