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Which of the following atoms is a cation?

A. 14 protons, 14 neutrons, 18 electrons

B. 34 protons, 45 neutrons, 36 electrons

C. 35 protons, 44 neutrons, 35 electrons

D. 82 protons, 125 neutrons, 78 electrons

Answer Explanation:

Because it has more protons than electrons, this atom has a positive charge and can be classified as a cation. When a metal such as sodium reacts to become stable, it loses its valence electrons. At first, it is a neutral atom with 11 protons and 11 electrons. When it loses an electron, the number of protons does not change, and the atom has 11 protons and 10 electrons. Because there is one more positively charged proton, a cation forms. A cation is an ion with a net positive charge.

Therefore, the Correct Answer is D.

More Questions on TEAS 7 Science

  • Q #1: Which example is part of the scientific method?

    A. A student reads about a new way to harness energy from the sun.

    B. A researcher studies the effects of car exhaust on how people breathe.

    C. A researcher analyzes how many plants respond well to a new fertilizer

    D. A student discovers how insulin plays a role in the development of diabetes

    Answer Explanation

    One step of the scientific method is to analyze information or data collected from the experiment to conclude whether the hypothesis is supported.

    Recall that these make up the scientific method, described below:

    • Problem: The question created because of an observation. Example: Does the size of a plastic object affect how fast it naturally degrades in a lake?
    • Research: Reliable information available about what is observed. Example: Learn how plastics are made and understand the properties of a lake.
    • Hypothesis: A predicted solution to the question or problem. Example: If the plastic material is small, then it will degrade faster than a large particle.
    • Experiment: A series of tests used to evaluate the hypothesis. Experiments consist of an independent variable that the researcher modifies and a dependent variable that changes due to the independent variable. They also include a control group used as a standard to make comparisons. 
      • Example: Collect plastic particles both onshore and offshore of the lake over time. Determine the size of the particles and describe the lake conditions during this time period.
    • Observe: Analyze data collected during an experiment to observe patterns. 
      • Example: Analyze the differences between the numbers of particles collected in terms of size.
    • Conclusion: State whether the hypothesis is rejected or accepted and summarize all results.
    • Communicate: Report findings so others can replicate and verify the results.

  • Q #2: Which of the following is supported by the cell theory?

    A. Cells are alive and recognized as the building blocks for life.

    B. Scientists can identify and differentiate cells by using a microscope

    C. Cells are produced from existing cells using meiosis instead of mitosis.

    D. Living things are composed of a single cell that remains undifferentiated

    Answer Explanation

    After scientists were able to view cells under the microscope they formulated the cell theory. One part of this theory concluded that all cells are alive. They also represent the basic unit of life.

    All living things are made of cells. Cells are the smallest structural units and basic building blocks of living things. Cells contain everything necessary to keep living things alive. Varying in size and shape, cells carry out specialized functions. This theory, or in-depth explanation, about cells consists of three parts:

    • All living things are composed of one or more cells.
    • Cells are alive and represent the basic unit of life.
    • All cells are produced from pre-existing cells.

     

  • Q #3: What organelle is only associated with plant cells?

    A. Cell wall

    B. Ribosome

    C. Cytoplasm

    D. Golgi apparatus

    Answer Explanation

    Only plant cells have cell walls, which help protect the cell and provide structural support.  The cell wall also enforces the overall structural integrity of the plant cell, and it is found outside the cell membrane. The next organelle is a chloroplast. It is found in the cytoplasm of only plant cells. Chloroplasts are photosynthetic compounds used to make food for plant cells by harnessing energy from the sun. These organelles play a role in photosynthesis.