Videos
The smallest unit of matter with unique characteristics is
- a. an electron.
- b. a molecule.
- c. an atom.
- d. a proton.
Introduction:
Atom is a simplest unit of matter composed of particles like electrons, neutrons and electrons. Protons are positively charged particles in the nucleus; electrons are present in the outer orbitals and contain a negative charge. Neutrons do not possess any charge and are present in the nucleus.
Answer to Problem 1MCQ
Correct answer:
Simplest unit of matter with unique characteristics is called as an atom.
Therefore, option (c) is correct.
Option (c) is given as “an atom”.
Explanation of Solution
Justify the reason for the correct statement:
As the atom is the smallest unit of matter and it cannot be divided further. Therefore, it exhibits unique characteristics with the presence of charged particles inside it.
Hence, option (c) is correct.
Justify reasons for incorrect statements:
Option (a) is given as “an electron”.
An electron consists of a negative charge and these particles are present in the outer orbital. Hence, it is a wrong answer.
Option (b) is given as “a molecule”.
A molecule is composed of various atoms. Hence, it is a wrong answer.
Option (d) is given as “a proton”.
A proton is a positively charged particle present in the nucleus. Hence, it is a wrong answer.
Hence, options (a), (b), and (d) are incorrect.
Atom is a substance which cannot be broken into smaller parts, therefore, it is considered the smallest unit of matter.
Want to see more full solutions like this?
Chapter 2 Solutions
Microbiology: A Systems Approach
- A substance that has weight and occupies space is calleda. kinetic energy.b. a catalyst.c. matter.d. potential energy.arrow_forwardThe name given to the atomic particle found outside the nucleus of an atom isa. proton.b. neutron.c. electron.d. ion.arrow_forwardWhich of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All molecules consist of atoms. d. Free radicals are dangerous because they emit energyarrow_forward
- Which of the following molecules generally possesses a complex shape that allows the molecule to function as tools and machinery that essentially do all the work within a living cell? 20. A. triglycerides B. proteins C. carbohydrate D. A and B are correct.arrow_forwardWhich of the following is a representation of a covalently bonded molecule that shows the relative size and position of atoms in three dimensions? A. Structural model B. Structural formula C. Shell model D. Chemical formulaarrow_forwardThe atomic number gives thea. number of neutrons in the nucleus.b. number of protons in the nucleus.c. weight of the atom.d. number of protons in the valence shell.arrow_forward
- Describe the unique features of the following molecules, why are the critical to life? a. Carbohydrates b. Lipids. c. Proteins. d. Nucleic Acids.arrow_forwardThe weak attractive force between two water molecules forms a(n)a. covalent bond. c. ionic bond. e. isotope.b. hydrogen bond. d. compound.arrow_forwardMolecules that are found in living cells and contain the element___________ are considered organic molecules.a. hydrogenb. carbonc. oxygend. nitrogene. calciumarrow_forward
- This occurs when the cations and anions are attracted to the positive and negative ends of water molecules: A. ionic bonding B. dissociation C. covalent bonding D. hydrogen bondingarrow_forwardWhich of the following statements about chemicalbonds is true?a. Covalent bonds are stronger than ionic bonds.b. Hydrogen bonds occur between two atoms ofhydrogen.c. Bonding readily occurs between nonpolar andpolar molecules.d. A molecule of water is unlikely to bond with anion.arrow_forwardThe nucleus of an atom contains: a. neutrons and electrons b. protons and electrons c. protons only d. neutrons and protons e. neutrons onlyarrow_forward
