ALL YOUR WORK. I get ALL YOUR test contains short answer questions and problems.

Question

ALL YOUR WORK. I get ALL YOUR test contains short answer questions and problems. For the problems, SHOW l do not award credit without work. Take time and set-up the problems. You will t at least 80% credit for setting-up the problem correctly. BE NEAT . Anything not easily understood could be marked wrong. READ the question and THINK about you're being asked before you start to answer. Do NOT try to make the questions hard. Watch your units. Cell phone usage is not allowed. This test contains 3 pages. Be sure you have a complete test and write your name on all pages . Short Answers (2 points per blank: 30 points total) 1. The unit system used in scientific work is the 2. What is the metric prefix for 102? 3. How many mg are in 2.1 kg? 4. Complete the following table: Name of Nuclear Atomic Atomic Number of Number of Number of Element SymbolNumber MassProtons Neutrons Electrons Chlorine (CI)CI Platinum (Pt) | . '78 pt | 35 17 18 17 17 197 and it contains 6. The central part of an atom is called its and 7. Atoms of the same element always have the same number of nf an atm resides in its

Explanation / Answer

The SI unit or units allowed by system of international

deci = 10-2or 0.01

1 kg = 1000 g

So 2 kg = 2000 g

2.1 kg = 2100 g

atomic number = number of protons

mass number = number of protons + number of neutrons

therefore, number of neutrons = mass number – atomic number

In 17Cl35 = 35-17 = 18, like in Pt = 195-78 = 117

number of electrons in atom = number of protons or atomic number

so , in Chlorine = 17

and in Pt = 78

The central part of an atom is called nucleus and it contains Protons and neutrons. Atoms of the same element always have same number of protons.

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