Atoms Bohr Models Isotopes Flashcards
Flashcard
•
Science
•
9th Grade
•
Hard
Joann Watts
FREE Resource
Student preview
23 questions
Show all answers
1.
FLASHCARD QUESTION
Front
A mystery atom contains the following particles: 7 protons, 7 neutrons, 7 electrons. The mystery atom is:
Back
nitrogen atom
Answer explanation
The mystery atom has 7 protons, which defines its atomic number as 7. This corresponds to nitrogen on the periodic table. The equal number of electrons indicates it is neutral, confirming it is a nitrogen atom.
2.
FLASHCARD QUESTION
Front
What is an atom’s nucleus made of?
Back
protons and neutrons
Answer explanation
An atom's nucleus is composed of protons and neutrons. Protons are positively charged, while neutrons have no charge. Electrons, which are negatively charged, orbit the nucleus but are not part of it.
3.
FLASHCARD QUESTION
Front
An element’s mass number is equal to its number of
Back
protons + neutrons.
Answer explanation
The mass number of an element is the total count of protons and neutrons in its nucleus. Therefore, the correct answer is 'protons + neutrons.' This reflects the combined mass of these two subatomic particles.
4.
FLASHCARD QUESTION
Front
A common, neutral atom of fluorine has _______ protons, _______ neutrons, and _______ electrons.
Back
9, 10, 9
Answer explanation
A neutral atom of fluorine has 9 protons (its atomic number), 10 neutrons (the most common isotope), and 9 electrons to balance the charge, making the correct choice 9, 10, 9.
5.
FLASHCARD QUESTION
Front
An atom of sulfur has an atomic number of 16 and a mass number of 32. Which of the following statements about this sulfur atom is true?
Back
It has 16 protons and 16 neutrons.
Answer explanation
A sulfur atom has an atomic number of 16, meaning it has 16 protons. The mass number is 32, which is the sum of protons and neutrons. Therefore, it has 32 - 16 = 16 neutrons. The correct statement is: It has 16 protons and 16 neutrons.
6.
FLASHCARD QUESTION
Front
What is the atomic number of an element that has 19 protons, 19 electrons, and 20 neutrons?
Back
19
Answer explanation
The atomic number of an element is defined by the number of protons it has. Since this element has 19 protons, its atomic number is 19, making the correct answer 19.
7.
FLASHCARD QUESTION
Front
Which of the following subatomic particles are closest in mass?
Back
proton and neutron
Answer explanation
The proton and neutron have similar masses, both being approximately 1 atomic mass unit, while the electron is much lighter. Therefore, the closest in mass are the proton and neutron.
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