Atomic Mass From Atomic Abundance Chemistry Problem

Atomic Mass From Atomic Abundance Chemistry Problem You may have noticed the atomic mass of an element isnt the same as the sum of the protons and neutrons of a single atom. This is because elements exist as multiple isotopes. While each atom of an element has the same number of protons, it can have a variable number of neutrons. The atomic mass on the periodic table is a weighted average of the atomic masses of atoms observed in all samples of that element. You can use the atomic abundance to calculate the atomic mass of any element sample if you know the percentage of each isotope. Atomic Abundance Example Chemistry Problem The element boron consists of two isotopes, 105B and 115B. Their masses, based on the carbon scale, are 10.01 and 11.01, respectively. The abundance of 105B is 20.0% and the abundance of 115B is 80.0%. What is the atomic mass of boron? Solution: The percentages of multiple isotopes must add up to 100%. Apply the following equation to the problem: atomic mass (atomic mass X1) Â · (% of X1)/100 (atomic mass X2) Â · (% of X2)/100 ...where X is an isotope of the element and % of X is the abundance of the isotope X. Substitute the values for boron in this equation: atomic mass of B (atomic mass of 105B Â · % of 105B/100) (atomic mass of 115B Â · % of 115B/100)atomic mass of B (10.01Â · 20.0/100) (11.01Â · 80.0/100)atomic mass of B 2.00 8.81atomic mass of B 10.81 Answer: The atomic mass of boron is 10.81. Note that this is the value listed in the periodic table for the atomic mass of boron. Although the atomic number of boron is 10, its atomic mass is nearer to 11 than to 10, reflecting the fact that the heavier isotope is more abundant than the lighter isotope. Why Arent Electrons Included? The number and mass of electrons is not included in an atomic mass calculation because the mass of the electron is infinitesimal compared to that of a proton or neutron. Basically, electrons dont significantly affect the mass of an atom.

Culture and Family in Nursing Essay Example | Topics and Well Written Essays - 1750 words

Culture and Family in Nursing - Essay Example A vital objective for health care providers, as for instance, is established in the increasing acknowledgment of the family's value to a child's recovery and the influence of child's infirmity on the family. The importance of understanding the impact of culture on family health and nursing is related to a considerate practice of the family, as it establishes a realism that confirms the analysis that professional nursing perform which is crucial to health care. As realization increases on the influence of culture, concern is heightened in improving the efficiency of the involvement, given inconsistencies of cultural diversity, and the survival of children of minority families. (Radin, N., & Goldsmith, R. 1983 p 18) psychological needs for identity and sense of historical continuity. The ethnic background influences our way of thinking, our way of feelings, our way of working, and our way of relaxing, our way of celebrating holidays and customs, our way of expressing our anxieties, our way of belief about illness or life and death. Patterns of ethnicity, strengthened by family custom and community association, can function in delicate ways, normally outside of our consciousness; but their influence may however be extensive, deep and compelling. These patterns are capable to perform a significant responsibility throughout the family life series, though influence may differ among groups and within a group itself. In few families who cling to customary ways, adhering to groups from their spiritual or cultural background and apart from all others, ethnic values and classifications may be predominantly strong and probably to be kept for generations (Pleck 2000 p 48) Gender - a study shows that children at two and a half years of age practice gender classifications in negotiating their humanity and are possible to simplify gender classifications to several of activities, objects, and professions. Children yet refuse the truth of what they are perceiving when it does not correspond to their gender principles, such as the interpretation of a child that only men are doctors, when his or her mother is. Sons have a precise boundary concerning parental choices with regard to children; as majority of parents rather have male than female children, recognized all over the world. In the same manner, people who favor sons are more possible to apply technology for deciding on the sex of their child. This inclination for male children, furthermore, is accentuated by the ruling that parents are more possibly to maintain having children if they allow only girls than if they allow only boys. Explanations given by women for their choice for sons are to satisfy t heir husbands and to maintain the family name, and to be a companion to the husband. However, the reason for women desiring for daughters is their need for a companion for themselves and to have fun dressing a girl and doing her hair. 3 Parents influence their sons and daughters to get involve in sex-typed endeavors, as well as doll playing and managing housekeeping endeavors for girls and playing with trucks and participating in