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level: Level 1

Questions and Answers List

level questions: Level 1

QuestionAnswer
An atom contains dense (1) surrounded by shells of (2)1. Nucleus 2. Electrons
What two nucleons make up the nucleus?Protons and Neutrons
Each Electron shells is a certain distance from nucleus at its own particularEnergy level
Describe the charges and relative mass of each subatomic particle presentElectrons have a negative charge , and mass 1/1836 Protons have a positive charge, and mass 1 Neutrons are uncharged , and mass 1
The atomic number can be known as this, and what is the atomic numberAtomic/ Proton number is the number of protons in the nucleus
What does every atom of the same element have in common?Every atom of the same element has the same Atomic number
Mass number is also known as this, what is the mass numberMass number ( nucleon number) is the number of protons plus the number of neutrons in the nucleus of an atom
What are isotopes?Isotopes are atoms of the same element with different mass number.
Why do Isotopes of particular elements have same chemical properties, but slightly different physical propertiesIsotopes of particular elements have same chemical properties because they have same number of electron. They have slightly different physical properties, because they have different number of neutrons
What are radioisotopes used for?To check leaks in oil or gas pipelines
How many protons, neutrons and electron, are there in neutral atoms?In neutral atom, number of positively charged protons in nucleus equals number of negatively charged electrons outside , nucleus
What are ionsIons are charged particles formed by the loss or gain of electrons from atom of group of covalently bonded atoms
When are positive ions formedWhen 1 or more electrons are lost
When are negative ions formedWhen 1 or more electron is gained