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Copper-65 has 29 protons and mass number 65. Helium has 2 protons and almost always has a mass number of 4. Very rarely, helium forms the isotope helium-3, which still has 2 protons but has a mass number of 3. One method of writing the formula for an isotope shows the element name...
4 In which atom is the number of protons equal to the number of neutrons? D A.$$ ^ { 4 0 } A r $$ B$$ ^ { 1 9 } F $$ C$$ ^ { 2 3 } N a $$ D$$ ^ { 1 6 } O $$ 相关知识点: 试题来源: 解析 D 反馈 收藏 ...
4 In which atom is the number of protons equal to the number of neutrons? D A. $$ ^ { 4 0 } A r $$ B $$ ^ { 1 9 } F $$ C $$ ^ { 2 3 } N a $$ D. $$ ^ { 1 6 } O $$ 相关知识点: 试题来源: 解析 D ...
To solve the problem, we need to find the number of neutrons in hydrogen, helium, and lithium, and then sum them up. Let's break this down step by step.Step 1: Understand the Mass Number and Atomic Number The mass number (A) of
The mass number of an atom is the total number of protons and neutrons contained within the nucleus of the atom. The number of protons determines the element and will always equal the atomic number of that element. The number of neutrons can change and will determine which isotope of that ...
Mass Number:The mass of an atom always consists in the nucleus and it is equal to the sum of proton and neutron that is present in the nucleus. The number of the electron in an atom is always equal to the number of protons.
2\. Above the symbol is the atomic number (Z) which is equal to the number of protons in the nucleus and the number of electrons in the electron cloud (given that the atom is neutral). For carbon Z=6. 3\. Below the symbol is the atomic mass. While this number is a weighted aver...
Answer to: State the number of protons, neutrons, and electrons for an ion of calcium-40 which has a charge of +2. By signing up, you'll get...
electrons, then it would have a positive charge overall. While if it had more electrons than protons, it would have an overall negative charge. Atoms with positive or negative charges are calledions. But for atoms they are always neutral and the number of protons equals the number of ...