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QR Challenge: Atoms

QuestionAnswer
What is the center of an atom called?nucleus
What subatomic particles are in the nucleus of an atom?protons and neutrons
What is the atomic number of Oxygen?8
The number of protons in an atom is the same as the number of ___?electrons
How many electrons can the first electron shell of an atom hold?2
The atomic mass of an element is the number of ___ + the number of ___.protons neutrons
What is the atomic mass of aluminum?27
What element has atomic number 2?helium
What do elements combine to create a molecule of water?oxygen hydrogen
How many electrons can the second shell of an atom hold?8
How many electrons can the third shell of an atom hold?8
What is the chemical symbol for iron?Fe
What is the atomic number of Calcium?20
How many protons are in an atom of Nickel?28
What element is K?Potassium
How many electrons are in an atom of Argon?18
How many neutrons are in an atom of Titanium?26
What is the atomic mass of Tin?119
How many protons are in an atom of Copper?29
How many electrons are in an atom of Radon?54
What is the atomic number of Silicon?14
What is the chemical symbol for Calcium?Ca
What element is Na?Sodium
The formula for salt is NaCl. What 2 elements make up a molecule of salt?Sodium Chlorine

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